United States Air and Radiation EPA420-P-99-020 Environmental Protection May 1999 Agency vvEPA Basic Exhaust Emission Rates of Open Loop Vehicles for MOBILE6: Exhaust Emissions at High and Low Altitudes for Engine Starts and Running Emissions for Motorcycles, Light Duty Diesel Vehicles and Trucks and Pre-1981 Model Year Light Duty Gasoline Vehicles and Trucks DRAFT > Printed on Recycled Paper ------- EPA420-P-99-020 May 1999 Basic Exhaust Emission Rates of Open Loop Vehicles for MOBILE6: Exhaust Emissions at High and Low Altitudes for Engine Starts and Running Emissions for Motorcycles, Light Duty Diesel Vehicles and Trucks and Pre-1981 Model Year Light Duty Gasoline Vehicles and Trucks M6.EXH.005 DRAFT David J. Brzezinski John Gilmore Assessment and Modeling Division Office of Mobile Sources U.S. Environmental Protection Agency NOTICE This technical report does not necessarily represent final EPA decisions or positions. It is intended to present technical analysis of issues using data which are currently available. The purpose in the release of such reports is to facilitate the exchange of technical information and to inform the public of technical developments which may form the basis for a final EPA decision, position, or regulatory action. DRAFT M6.EXH.005 1 May 5, 1999 ------- 1.0 INTRODUCTION "Open loop" is a term that refers to vehicles which do not use electronic feedback systems to control the delivery of fuel to the engine cylinders. Most current light-duty vehicles make use of feedback systems. However, motorcycles, older light-duty vehicles and most diesel vehicles are open-loop. This report discusses how the basic rates for both engine starts and exhaust running emissions for these open loop vehicles will be estimated for MOBILE6. The MOBILE6 basic exhaust emission rates for heavy duty trucks and 1981 and newer light-duty vehicles and trucks are discussed in separate reports. 2.0 DATA SOURCES In order to calculate the exhaust running emissions and the effect of engine start on exhaust emissions it is necessary to know the emissions from vehicles measured with and without and engine start. This can be estimated using the individual bag results from Federal Test Procedure (FTP) testing. However, the data from each individual bag of the FTP were not always saved, since only the composite results are usually needed. Since individual bag data is not available, it is not possible to use all of the data used to develop the basic emission rates used in MOBILES to develop the factors needed to determine the exhaust running emissions and the effect of engine start on exhaust emissions separately. 2.1 Motorcycles: The most recent available FTP test data on motorcycles was used in this report. These data were obtained from a series of tests performed on 25 motorcycles from various manufacturers in 1996 and 1997 for the California Air Resources Board (CARB) by Northern California Diagnostic Laboratories and California Environmental Engineering. The tests included motorcycles from model years 1992 through 1995. The tested motorcycles had an average mileage of slightly less than 12,000 miles, with a mileage range from 981 to 47,594 miles. None of the motorcycle testing information used to develop the basic emission rates used in MOBILES included the emission rates by FTP bag. As a result, only the results from the recent California testing were used to determine the split between exhaust running versus engine start emissions. 2.2 Diesels: A total of forty Light Duty Diesel Vehicles (LDDV) were tested using the FTP at two sites in two different time periods. Twenty 1967-1975 Diesel LDVS were tested in Phoenix by Auto Testing Laboratories (ATL) in November and December of 1977 and twenty 1980 models were tested in Ann Arbor at the EPA's National Vehicle Fuel and Emissions Laboratory (NVFEL) during July, August and September of 1983. The Phoenix vehicles had an average DRAFT M6.EXH.005 2 May 5, 1999 ------- mileage of 86,300 miles with a range from 14,000 to 369,000 miles; the Ann Arbor vehicles had an average mileage of 70,000 with a range from 40,600 to 119,000 miles. These same data were used to develop the basic emission rates used in MOBILES. 2.3 Pre-1981 Model Year Light Duty Gasoline Vehicles and Trucks: More than 12,000 vehicle tests from the EPA Emission Factor program for pre-1981 model year light-duty gasoline fueled passenger cars and light-duty gasoline fueled trucks which included individual bag-by-bag FTP results were used for this analysis. However, the sample size was small for some model year groupings, especially for high altitude areas. These same data were used to develop the basic emission rates used in MOBILES. Sample sizes for these vehicles are shown in the tables. 3.0 METHODOLOGY In addition to the FTP data described in Section 2.0, additional FTP test results, which do not have individual bag-by-bag breakouts of emissions, were used to develop the basic emission factor rates found in the MOBILES model. In order to include all of the available data, a methodology which begins with the basic emission factor emission rates in MOBILES was chosen as the basis for the composite emission rates estimated for MOBILE6 for motorcycles, light-duty diesel vehicles and pre-1981 model year gasoline passenger cars and light-duty trucks. The specific bag-by-bag data were used to estimate the allocation of the basic emission rate into the portion that represents the effect of engine start and the exhaust running emissions. These allocations were then applied to the existing MOBILES emission factor estimates. This section of the report describes the methodology used to develop the factors used to transform the "zero mile level" (ZML) emissions and "deterioration rates" (DET) used in the basic exhaust emission factors in MOBILES to rates applicable to MOBILE6. All of the MOBILES emission rates for the vehicle classes and model years covered in this analysis are simple linear estimates versus mileage. The emission rates for both engine start and running emissions for the vehicle classes and model years covered in this analysis are also assumed to be linear. The model year groupings used in the analysis (and shown in the tables) are taken directly from the groupings used for the basic emission rates in MOBILES. These are based on changes in technology (i.e., introduction of catalysts) and changes in the exhaust emission standards. The model year grouping will sometimes vary depending on the pollutant. The sum of the two equations (engine start and running) will not equal the composite FTP results. The FTP includes two engine starts, one after a 12 hour period without the engine running (12-hour soak) and one after a 10 minute soak. The MOBILE6 model will have explicit emission rates for the 12 hour soak engine start emission effects and the exhaust running emission rate. The effect of engine starts with soak times of less than 12 hours are calculated from the 12-hour soak estimate using correction factors within MOBILE6. These correction factors are discussed in the report, "The Determination of Start Emissions as a Function of DRAFT M6.EXH.005 3 May 5, 1999 ------- Mileage and Soak Time for 1981-1993 Model Year Light-Duty Vehicles," (M6.STE.003). In this way, a variety of soak times can be modeled using MOBILE6. An FTP estimate can be made by summing the exhaust running emission rate (in grams per mile) with a weighted engine start emission estimate (converted to grams per mile). A composite FTP value contains a portion (43%) of the emissions from an engine start after a 12- hour soak and a portion (57%) of the emissions from an engine start after a 10 minute soak. The basic exhaust emission rate from an engine start in MOBILE6 represents only emissions from a 12-hour soak. The emissions from a 10 minute soak must be calculated from the 12 hour soak and the two results appropriately weighted. Then, the results (in grams) must be divided by 7.49 miles (the length of the LA4 trip) to be converted to grams per mile. 3.1 Engine Start Emissions Fraction Recent testing by EPA has included the measurement of emissions on fully warmed vehicles over the first 505 seconds of the FTP driving cycle without the inclusion of an engine start (a "Hot Running 505"). These results can be directly compared to Bag 1 and Bag 3 of the FTP (which contain the effects of an engine start) to determine the emission impact of engine start on the emissions of a trip. These data have been used to develop a relationship between the emission impact of engine starts and the measured FTP emissions. This relationship is described in the report, "The Determination of Hot Running Emissions From FTP Bag Emissions," (M6.STE.002). Older model years of light-duty vehicles, diesel vehicles or motorcycles were not included in recent testing. However, the same technique can be used to help estimate the effect of engine starts for these other vehicle classes as well. The Federal Test Procedure is basically a single LA4 cycle trip containing a mix of engine start emissions. The engine start portion of the FTP (the first 505 seconds of the LA4 or the "505") makes up about 48% of the miles traveled during the LA4 (3.59 miles in the 505, divided by the total 7.49 miles in the LA4). Both Bag 1 and Bag 3 of the FTP use the same driving cycle (505) and contain an engine start. The FTP assumes that 43% of the trips start with an engine off soak time of at least 12 hours (a "cold" start), which is represented by Bag 1, and the remaining starts are represented by Bag 3 (a "hot" start after a 10 minute soak). So, any emissions from Bag 1 (in grams per mile) must be weighted by the fraction of travel represented by the 505 (48%) and the fraction of trips that begin after a 12 hour soak period (43%), or 20.6% (48% times 43%). Those familiar with the MOBILE model may recognize this fraction as the default VMT normally assigned to the "cold" start operating mode. The calculation of Start Emissions is based on the assumption that, on average, the effect on emissions that is attributable to an engine start can be represented by a simple fraction of total FTP emissions, which includes the effects of engine starts. The basic engine start emission rate in MOBILE6 is meant to represent the effect on exhaust emissions from the first engine start in the FTP, after a 12 hour soak period. The effect of engine start on emissions is defined to be that fraction of the total emissions collected during the FTP represented by the portion of the Bag 1 DRAFT M6.EXH.005 4 May 5, 1999 ------- emissions that remains when emissions measured over the same driving cycle, on a fully warm engine without an engine start, are subtracted from it. The formula used to obtain the engine start emission fraction is therefore: (1) Engine Start Emissions Fraction = ( ( Bagl - HR505 ) * 0.206 ) / FTP Bag 1 is the emissions measured in the first 505 seconds of the FTP, FIR505 is the emissions measured for the Hot Running 505, 0.206 is the proportion of the FTP VMT attributable to Bag 1, and FTP is the Federal Test Procedure emissions. All emissions are in grams per mile. Using coefficients described in the report, "The Determination of Hot Running Emissions From FTP Bag Emissions," (M6.STE.002), the HR505 results were estimated using FTP bag information. Using this HR505 estimate and the FTP bag information, the Engine Start Emission Fraction for motorcycles, light-duty diesel vehicles and pre-1981 model year gasoline passenger cars and light-duty trucks could be calculated. Table 1 shows the results of the calculation of the Engine Start Emissions Fraction for light-duty diesel vehicles, motorcycles and the older (pre-1981 model year) gasoline passenger cars and light-duty trucks. 3.2 Exhaust Running Emissions Fraction The calculation of Exhaust Running Emissions for motorcycles, light-duty diesel vehicles and pre-1981 model year gasoline passenger cars and light-duty trucks is based on the assumption that, on average, the basic exhaust running emissions rate can be represented by the total FTP emissions less the fraction of emission attributable to the effects of engine starts (both cold and hot starts). The previous section describes how the fraction of emissions attributable to the effects of engine start are estimated. The effect of engine start on emissions is found in both Bag 1 and Bag 3 of the FTP (Federal Test Procedure). Both the FTP Bag 1 and Bag 3 driving cycle is the first 505 seconds of the LA4 driving cycle. Emissions measured over the same driving cycle (the 505), on a fully warm engine without an engine start, is referred to as a Hot Running 505 (HR505). If a HR505 is substituted for both Bag 1 and Bag 3 in the calculation of FTP emissions, the resulting exhaust emission rate represents a LA4 trip without the effect of engine starts. This Hot Running LA4 will be used as the basic exhaust running emission rate in MOBILE6. The driving cycle used for Bag 2 of the FTP makes up about 52.1% of the miles traveled during the LA4 (3.91 miles in the Bag 2 cycle, divided by the total 7.49 miles in the LA4). Both DRAFT M6.EXH.005 5 May 5, 1999 ------- Bag 1 and Bag 3 can be replaced by the HR505 (without engine starts), and weighted by the remaining VMT in the FTP, or 47.9%, to give the Hot Running LA4 basic exhaust running emission rate. The formula used to obtain the exhaust running emission fraction is therefore: (2) Exhaust Running Emission Fraction = ( (HR505*0.479) + (Bag2*0.521) ) / FTP FIR505 is the emissions measured for the Hot Running 505, 0.479 is the proportion of the FTP VMT attributable to the Bag 1 and Bag 3, Bag 2 is the emissions measured during the second bag of the FTP, 0.521 is the proportion of the FTP VMT attributable to the Bag 2 and FTP is the Federal Test Procedure emissions. All emissions are in grams per mile. As was done for engine starts, using coefficients developed from actual measured HR505 values for a sample of vehicles, the HR505 results can be estimated using FTP bag information. This relationship is described in the report, "The Determination of Hot Running Emissions From FTP Bag Emissions," (M6.STE.002). Using this HR505 estimate and the available FTP bag information, the Exhaust Running Emission Fraction was calculated for motorcycles, light-duty diesel vehicles and pre-1981 model year gasoline passenger cars and light-duty trucks. Table 2 shows the results of the calculation of the Exhaust Running Emission Fraction for motorcycles, light-duty diesel vehicles and pre-1981 model year gasoline passenger cars and light-duty trucks. 3.3 Calculating Zero Mile Level and Deterioration Rates for MOBILE6 The linear coefficients, zero mile level (ZML) and deterioration (DET) basic emission rates, in MOBILE6 for light-duty diesel vehicles, motorcycles and the older (pre-1981 model year) gasoline passenger cars and light-duty trucks are determined using the fractions developed in the previous sections. The linear basic emission rates (emission factors) in MOBILES (ZML's and DET's) predict the FTP emissions of these vehicles versus mileage. Using the fractions developed in the previous sections, the proportion of FTP emissions that are the effect of engine start and exhaust running emissions were calculated from the MOBILES basic emission rates. The equations calculate exhaust emission engine start and running emissions from the MOBILES emission factor coefficients would be: (3) MOBILE6 ZMLS (grams) = MOBILES ZML (g/mi) * X * 7.49 miles (4) MOBILE6 DETS (grams/1 Ok-mi) = MOBILES DET (g/mi/lOk-mi) * X * 7.49 miles and DRAFT M6.EXH.005 6 May 5, 1999 ------- (5) MOBILE6 ZMLR (g/mi) = MOBILES ZML (g/mi) * Y (6) MOBILE6 DETR (g/mi/1 Ok-mi) = MOBILES DET (g/mi/1 Ok-mi) * Y where: X = Engine Start Emissions Fraction Y = Exhaust Running Emission Fraction MOBILES ZML = MOBILES emission factor zero mile intercept coefficient (g/mi) MOBILES DET = MOBILES emission factor deterioration coefficient (g/mi/1 Ok mi) MOBILE6 ZMLS = MOBILE6 engine start emission zero mile intercept coefficient (grams) MOBILE6 DETS = MOBILE6 engine start emission deterioration coefficient (grams/1 Ok mi) MOBILE6 ZMLR = MOBILE6 exhaust running emission zero mile intercept coefficient (g/mi) MOBILE6 DETR = MOBILE6 exhaust running emission deterioration coefficient (g/mi/1 Ok mi) The 7.49 miles is the miles in the LA4 driving schedule of the FTP. This multiplication is necessary to convert the grams per mile used for the basic emission rate to grams. The effect of engine start on emissions in MOBILE6 is expressed in grams. For some model years there were no data that could be used to determine the appropriate exhaust running and engine start emission fractions. In these cases, the fractions used for these model years were taken from similar groupings. For example, we only have bag data for 1992 and newer model year motorcycles. The fractions calculated from these motorcycles will be applied to all model year motorcycle emission factors from MOBILES. Similarly, light-duty diesel passenger car results were used for light-duty diesel trucks and low altitude diesel and motorcycle fractions were used for high altitude estimates. Table 3 through Table 14 show the results of application of the appropriate exhaust running and engine start emission fractions to the MOBILES emission factors. The resultant emission rate coefficients for exhaust running and engine start emissions are proposed to be used for light-duty diesel vehicles, motorcycles and the older (pre-1981 model year) gasoline passenger cars and light-duty trucks in MOBILE6. DRAFT M6.EXH.005 7 May 5, 1999 ------- Table 1 Engine Start Emissions Fractions Pollutant Model Years Sample Size Sample Average Bagl Emissions (g/mi) Calculated Average HR505 Emissions (g/mi) Sample Average Composite FTP Emissions (g/mi) Engine Start Emissions Fraction Result Low Altitude Light Duty Gasoline Vehicles THC THC THC THC THC THC CO CO CO CO CO CO NOx NOx NOx NOx NOx NOx Pre-1968 1968-69 1970-71 1972-74 1975-79 1980 Pre-1968 1968-69 1970-71 1972-74 1975-79 1980 Pre-1968 1968-72 1973-74 1975-76 1977-79 1980 724 712 896 1950 5050 599 724 712 896 1950 5050 599 724 2289 1269 2916 2134 599 10.371 7.838 6.538 5.260 3.189 1.615 113.950 100.338 81.491 65.604 43.874 20.733 4.894 7.503 6.542 5.095 5.263 2.219 6.870 4.745 3.750 2.659 0.829 0.317 20.630 15.994 12.822 10.549 5.109 1.620 4.309 5.837 2.940 2.658 2.568 1.645 10.356 7.276 5.896 4.176 1.682 0.680 114.408 87.482 67.294 51.900 26.304 8.557 4.289 5.394 3.566 3.077 3.041 1.741 0.07 0.09 0.10 0.13 0.29 0.39 0.17 0.20 0.21 0.22 0.30 0.46 0.03 0.06 0.21 0.16 0.18 0.07 DRAFT M6.EXH.005 May 5, 1999 ------- Table 1 (continued) Engine Start Emissions Fractions Pollutant Model Years Sample Size Sample Average Bagl Emissions (g/mi) Calculated Average HR505 Emissions (g/mi) Sample Average Composite FTP Emissions (g/mi) Engine Start Emissions Fraction Result High Altitude Light Duty Gasoline Vehicles THC THC THC THC THC THC THC THC CO CO CO CO CO CO CO CO Pre 1968 1968-69 1970-71 1972-74 1975-76 1977 1978-79 1980 Pre 1968 1968-69 1970-71 1972-74 1975-76 1977 1978-79 1980 114 74 128 365 367 125 302 69 114 74 128 365 367 125 302 69 12.808 10.145 8.942 6.690 4.077 3.355 4.313 2.419 153.912 130.575 128.921 103.537 72..609 44.966 70.976 48.981 6.807 4.641 4.001 3.730 1.712 0.840 1.556 0.463 23.278 17.980 17.571 17.776 10.875 4.825 9.103 5.314 10.114 7.104 6.188 5.712 2.782 1.585 2.607 0.955 129.744 97.410 94.451 91.826 52.409 24.669 45.464 25.672 0.122 0.160 0.164 0.107 0.175 0.327 0.218 0.422 0.207 0.238 0.243 0.192 0.243 0.335 0.280 0.350 DRAFT M6.EXH.005 May 5, 1999 ------- Table 1 (continued) Engine Start Emissions Fractions Pollutant Model Years Sample Size Sample Average Bagl Emissions (g/mi) Calculated Average HR505 Emissions (g/mi) Sample Average Composite FTP Emissions (g/mi) Engine Start Emissions Fraction Result High Altitude Light Duty Gasoline Vehicles NOx NOx NOx NOx NOx NOx NOx Pre 1968 1968-72 1973-74 1975-76 1977 1978-79 1980 114 339 228 367 125 302 89 2.304 4.718 4.919 4.102 5.323 1.945 1.101 2.014 3.472 2.001 1.706 1.472 1.094 0.744 2.046 3.634 2.539 2.158 2.225 1.252 0.820 0.029 0.071 0.237 0.229 0.356 0.140 0.090 Low Altitude Light Duty Gasoline Trucks (<6,000 Ibs. GVW) THC THC CO CO NOx NOx 1975-78 1979-80 1975-78 1979-80 1975-78 1979-80 239 91 239 91 239 91 3.135 2.167 40.727 29.217 3.690 2.554 1.201 0.675 5.596 3.454 2.602 1.839 2.024 1.219 26.576 15.591 2.743 1.950 0.197 0.253 0.272 0.432 0.082 0.075 DRAFT M6.EXH.005 10 May 5, 1999 ------- Table 1 (continued) Engine Start Emissions Fractions Pollutant Model Years Sample Size Sample Average Bagl Emissions (g/mi) Calculated Average HR505 Emissions (g/mi) Sample Average Composite FTP Emissions (g/mi) Engine Start Emissions Fraction Result Low Altitude Light Duty Gasoline Trucks (6,001-8,500 Ibs. GVW) THC THC CO CO NOx NOx 1975-78 1979-80 1975-78 1979-80 1975-78 1979-80 139 68 139 68 139 68 8.681 2.823 103.935 37.444 5.481 2.806 4.195 0.990 10.920 4.070 4.686 1.860 6.355 1.698 61.498 21.143 4.642 1.951 0.145 0.222 0.312 0.325 0.035 0.100 High Altitude Light Duty Gasoline Trucks (<6,000 Ibs. GVW) THC THC CO CO NOx NOx 1975-78 1979-80 1975-78 1979-80 1975-78 1979-80 28 7 28 7 28 7 3.665 5.113 62.060 98.271 2.429 1.467 1.368 2.035 8.588 13.592 1.658 .922 2.271 3.300 41.724 68.612 1.769 1.015 0.208 0.192 0.264 0.254 0.090 0.111 High Altitude Light Duty Gasoline Trucks (6,001-8,500 Ibs. GVW) THC THC CO CO NOx NOx 1975-78 1979-80 1975-78 1979-80 1975-78 1979-80 1 17 1 17 1 17 10.930 3.913 124.400 74.217 2.910 1.838 5.160 0.777 18.390 6.755 2.54 1.054 7.760 1.590 96.990 35.611 2.520 1.204 0.153 0.406 0.225 0.390 0.030 0.134 DRAFT M6.EXH.005 11 May 5, 1999 ------- Table 1 (continued) Engine Start Emissions Fractions Pollutant Model Years Sample Size Sample Average Bagl Emissions (g/mi) Calculated Average HR505 Emissions (g/mi) Sample Average Composite FTP Emissions (g/mi) Engine Start Emissions Fraction Result Low Altitude Light Duty Diesel Vehicles THC CO NOx Pre-1981 Pre-1981 Pre-1981 40 40 40 0.712 2.155 1.577 0.397 0.843 1.537 0.688 1.798 1.626 0.094 0.150 0.005 Low Altitude Motorcycles THC CO NOx All All All 25 25 25 1.512 15.563 1.067 0.765 5.055 0.592 1.263 16.597 0.680 0.122 0.132 0.144 DRAFT M6.EXH.005 12 May 5, 1999 ------- Table 2 Exhaust Running Emission Fractions Pollutant Model Years Sample Size Calculated Average HR505 Emissions (g/mi) Sample Average Bag 2 Emissions (g/mi) Sample Average Composite FTP Emissions (g/mi) Exhaust Running Emissions Fraction Result Low Altitude Light Duty Gasoline Vehicles THC THC THC THC THC THC CO CO CO CO CO CO NOx NOx NOx NOx NOx NOx Pre-1968 1968-69 1970-71 1972-74 1975-79 1980 Pre-1968 1968-69 1970-71 1972-74 1975-79 1980 Pre-1968 1968-72 1973-74 1975-76 1977-79 1980 724 712 896 1950 5050 599 724 712 896 1950 5050 599 724 712 896 1950 5050 599 6.870 4.747 3.750 2.659 0.829 0.317 20.630 15.994 12.822 10.549 5.109 1.620 4.309 5.837 2.940 2.658 2.568 1.645 11.130 7.555 6.006 4.010 1.194 0.409 126.404 95.359 72.299 54.242 24.339 5.410 3.522 4.643 2.272 2.171 2.120 1.426 10.360 7.276 5.898 4.176 1.682 0.680 114.408 87.483 67.294 51. .900 26.304 8.557 4.289 5.934 3.566 3.077 3.041 1.741 0.88 0.85 0.84 0.81 0.61 0.54 0.66 0.66 0.65 0.64 0.58 0.42 0.91 0.88 0.73 0.78 0.77 0.88 DRAFT M6.EXH.005 13 May 5, 1999 ------- Table 2 (continued) Exhaust Running Emission Fractions Pollutant Model Years Sample Size Calculated Average HR505 Emissions (g/mi) Sample Average Bag 2 Emissions (g/mi) Sample Average Composite FTP Emissions (g/mi) Exhaust Running Emissions Fraction Result High Altitude Light Duty Gasoline Vehicles THC THC THC THC THC THC THC THC CO CO CO CO CO CO CO CO Pre-1968 1968-69 1970-71 1972-74 1975-76 1977 1978-79 1980 Pre-1968 1968-69 1970-71 1972-74 1975-76 1977 1978-79 1980 114 74 128 365 367 125 302 89 114 74 128 365 367 125 302 89 6.807 4.641 4.000 3.730 1.712 0.840 1.556 0.463 23.278 17.980 17.571 17.776 10.675 4.825 9.103 5.314 9.850 6.438 5.537 5.443 2.407 1.034 2.155 0.553 126.915 90.971 86.857 91.143 47.023 18.928 37.981 17.821 10.114 7.104 6.188 5.712 2.782 1.585 2.607 0.995 129.744 97.410 94.451 91.826 52.409 24.669 45.464 25.672 0.830 0.785 0.777 0.809 0.746 0.594 0.717 0.512 0.596 0.575 0.567 0.610 0.565 0.493 0.531 0.461 DRAFT M6.EXH.005 14 May 5, 1999 ------- Table 2 (continued) Exhaust Running Emission Fractions Pollutant Model Years Sample Size Calculated Average HR505 Emissions (g/mi) Sample Average Bag 2 Emissions (g/mi) Sample Average Composite FTP Emissions (g/mi) Exhaust Running Emissions Fraction Result High Altitude Light Duty Gasoline Vehicles NOx NOx NOx NOx NOx 1973-74 1975-76 1977 1978-79 1980 228 367 125 302 89 2.001 1.706 1.472 1.094 0.744 1.619 1.417 1.226 0.912 0.658 2.539 2.158 2.225 1.252 0.820 0.710 0.721 0.604 0.798 0.852 Low Altitude Light Duty Gasoline Trucks (<6,000 Ibs. GVW) THC THC CO CO NOx NOx 1975-78 1979-80 1975-78 1979-80 1975-78 1979-80 239 91 239 91 239 91 1.201 0.675 5.596 3.454 2.602 1.839 1.765 0.946 25.345 12.223 2.010 1.518 2.024 1.219 26.576 15.591 2.743 1.950 0.739 0.670 0.598 0.515 0.836 0.587 High Altitude Light Duty Gasoline Trucks (<6,000 Ibs. GVW) THC THC CO CO NOx NOx 1975-78 1979-80 1975-78 1979-80 1975-78 1979-80 28 7 28 7 28 7 1.368 2.035 8.588 13.592 1.658 0.922 1.804 2.749 36.222 56.314 1.283 0.756 2.271 3.300 41.724 68.612 1.769 1.015 0.703 0.729 0.551 0.523 0.827 0.823 DRAFT M6.EXH.005 15 May 5, 1999 ------- Table 2 (continued) Exhaust Running Emission Fractions Pollutant Model Years Sample Size Calculated Average HR505 Emissions (g/mi) Sample Average Bag 2 Emissions (g/mi) Sample Average Composite FTP Emissions (g/mi) Exhaust Running Emissions Fraction Result Low Altitude Light Duty Gasoline Trucks (6,001-8,500 Ibs. GVW) THC THC CO CO NOx NOx 1974-78 1979-80 1974-78 1979-80 1974-78 1979-80 139 68 139 68 139 68 4.195 0.990 10.930 4.070 4.686 1.860 6.016 1.422 57.407 17.769 3.462 1.376 6.355 1.698 61.498 21.143 4.642 1.991 0.809 0.716 0.571 0.530 0.872 0.807 High Altitude Light Duty Gasoline Trucks (6,001-8,500 Ibs. GVW) THC THC CO CO NOx NOx 1974-78 1979-80 1974-78 1979-80 1974-78 1979-80 1 17 1 17 1 17 5.160 0.777 18.390 6.755 2.540 1.056 7.100 0.723 96.000 19.217 1.850 0.925 7.760 1.590 96.990 35.611 2.520 1.204 0.795 0.471 0.607 0.372 0.865 0.821 DRAFT M6.EXH.005 16 May 5, 1999 ------- Table 2 (continued) Exhaust Running Emission Fractions Pollutant Model Years Sample Size Calculated Average HR505 Emissions (g/mi) Sample Average Bag 2 Emissions (g/mi) Sample Average Composite FTP Emissions (g/mi) Exhaust Running Emissions Fraction Result Low Altitude Light Duty Diesel Vehicles THC CO NOx All All All 40 40 40 0.397 0.843 1.537 0.733 1.671 1.712 0.688 1.798 1.626 0.831 0.709 1.001 Low Altitude Motorcycles THC CO NOx All All All 25 25 25 0.765 5.055 0.592 1.216 15.629 0.449 1.263 16.597 0.680 0.792 0.637 0.761 DRAFT M6.EXH.005 17 May 5, 1999 ------- Table 3 Calculated MOBILE6 Basic Exhaust Emission Rates for Total Hydrocarbons (THC) Low Altitude Light Duty Gasoline Vehicles and Trucks Model Years MOBILES ZML (g/mi) MOBILES DET (g/mi/ 10k mi) Engine Start MOBILE6 ZML (grams) Engine Start MOBILE6 DET (g/lOkmi) Exhaust Running MOBILE6 ZML (g/mi) Exhaust Running MOBILE6 DET (g/mi/ 10k mi) Light Duty Gasoline Vehicles Pre-1968 1968-69 1970-71 1972-74 1975-78 1979-80 7.250 4.430 3.000 3.380 1.060 0.360 0.180 0.250 0.370 0.160 0.280 0.205 3.638 2.920 2.247 3.240 2.294 1.060 0.090 0.165 0.277 0.153 0.606 0.603 6.380 3.766 2.520 2.738 0.647 0.194 0.158 0.213 0.311 0.130 0.171 0.111 Light Duty Gasoline Trucks (<6,000 Ibs. GVW) Pre-1968 1968-69 1970-71 1972-74 1975-78 1979-80 7.250 4.430 3.000 3.360 1.800 0.870 0.180 0.250 0.370 0.170 0.270 0.280 10.861 6.636 4.494 5.033 2.696 1.629 0.270 0.375 0.554 0.255 0.404 0.524 5.365 3.278 2.220 2.486 1.332 0.583 0.133 0.185 0.274 0.126 0.200 0.188 Light Duty Gasoline Trucks (6,001-8500 Ibs. GVW) Pre-1970 1970-73 1974-78 1979-80 9.570 6.280 6.280 0.870 0.180 0.250 0.170 0.280 10.752 7.056 7.056 1.434 0.202 0.281 0.191 0.461 7.752 5.087 5.087 0.626 0.146 0.203 0.139 0.202 DRAFT M6.EXH.005 18 May 5, 1999 ------- Table 4 Calculated MOBILE6 Basic Exhaust Emission Rates for Total Hydrocarbons (THC) Low Altitude Motorcycles, Light Duty Diesel Vehicles and Light Duty Diesel Trucks Model Years MOBILES ZML (g/mi) MOBILES DET (g/mi/ 10k mi) Engine Start MOBILE6 ZML (grams) Engine Start MOBILE6 DET (g/lOkmi) Exhaust Running MOBILE6 ZML (g/mi) Exhaust Running MOBILE6 DET (g/mi/ 10k mi) Motorcycles Pre-1978 1978-79 1980-81 1982-84 1985-87 1988+ 8.78 2.40 1.93 1.65 1.31 1.20 0.75 1.44 1.15 0.95 0.75 0.70 8.012 2.190 1.761 1.506 1.195 1.095 0.684 1.314 1.049 0.867 0.684 0.639 6.952 1.900 1.528 1.306 1.037 0.950 0.594 1.140 0.911 0.752 0.594 0.554 Light Duty Diesel Vehicles Pre-1975 1975-79 1980+ 1.310 0.420 0.290 0.080 0.070 0.030 0.927 0.297 0.205 0.057 0.050 0.021 1.089 0.349 0.241 0.066 0.058 0.025 Light Duty Diesel Trucks Pre-1978 1978-80 1981+ 0.860 0.860 0.043 0.800 0.800 0.400 0.605 0.605 0.303 0.563 0.563 0.282 0.715 0.715 0.357 0.665 0.665 0.332 DRAFT M6.EXH.005 19 May 5, 1999 ------- Table 5 Calculated MOBILE6 Basic Exhaust Emission Rates for Carbon Monoxide (CO) Low Altitude Light Duty Gasoline Vehicles and Trucks Model Years MOBILES ZML (g/mi) MOBILES DET (g/mi/ 10k mi) Engine Start MOBILE6 ZML (grams) Engine Start MOBILE6 DET (g/lOkmi) Exhaust Running MOBILE6 ZML (g/mi) Exhaust Running MOBILE6 DET (g/mi/ 10k mi) Light Duty Gasoline Vehicles Pre-1968 1968-69 1970-71 1972-74 1975-79 1980 78.270 56.340 42.170 40.940 17.720 6.090 2.250 2.550 3.130 2.350 2.460 1.958 98.489 83.975 66.329 67.154 40.348 20.982 2.831 3.801 4.923 3.855 5.351 6.746 51.815 36.903 27.453 26.283 10.189 2.558 1.490 1.670 2.038 1.509 1.415 0.822 Light Duty Gasoline Trucks (<6,000 Ibs. GVW) Pre 1968 1968-69 1970-71 1972-74 1975-78 1979-80 78.270 56.340 42.170 40.780 24.550 12.280 2.250 2.550 3.130 2.440 2.590 2.430 158.285 113.936 85.280 82.469 49.647 31.272 4.550 5.157 6.330 4.934 5.238 6.188 39.918 28.733 21.507 20.798 12.521 6.263 1.148 1.301 1.596 1.244 1.321 1.239 Light Duty Gasoline Trucks (6,001-8500 Ibs. GVW) Pre- 1970 1970-73 1974-78 1979-80 93.980 60.080 60.080 12.280 225 2.55 2.44 2.43 218.212 139.500 139.500 30.352 5.224 5.921 5.665 6.006 53.569 34.246 34.246 6.508 1.283 1.454 1.391 1.288 DRAFT M6.EXH.005 20 May 5, 1999 ------- Table 6 Calculated MOBILE6 Basic Exhaust Emission Rates for Carbon Monoxide (CO) Low Altitude Motorcycles, Light Duty Diesel Vehicles and Light Duty Diesel Trucks Model Years MOBILES ZML (g/mi) MOBILES DET (g/mi/ 10k mi) Engine Start MOBILE6 ZML (grams) Engine Start MOBILE6 DET (g/lOkmi) Exhaust Running MOBILE6 ZML (g/mi) Exhaust Running MOBILE6 DET (g/mi/ 10k mi) Motorcycles Pre-1978 1978-79 1980-81 1982+ 33.42 24.39 17.51 17.40 3.22 3.56 2.53 2.46 32.927 24.030 17.252 17.143 3.172 3.507 2.493 2.424 21.272 15.524 11.145 11.075 2.050 2.266 1.610 1.566 Light Duty Diesel Vehicles Pre-1975 1975-76 1977 1978 1979 1980+ 2.710 1.170 1.170 1.170 1.170 1.150 0.130 0.090 0.090 0.090 0.090 0.040 3.048 1.316 1.316 1.316 1.316 1.293 0.146 0.101 0.101 0.101 0.101 0.045 1.921 0.830 0.830 0.830 0.830 0.815 0.092 0.064 0.064 0.064 0.064 0.028 Light Duty Diesel Trucks Pre-1978 1978-80 1981+ 1.97 1.97 1.33 0.100 0.100 0.040 2.213 2.213 1.494 0.112 0.112 0.045 1.397 1.397 0.943 0.071 0.071 0.028 DRAFT M6.EXH.005 21 May 5, 1999 ------- Table 7 Calculated MOBILE6 Basic Exhaust Emission Rates for Oxides of Nitrogen (NOx) Low Altitude Light Duty Gasoline Vehicles and Trucks Model Years MOBILES ZML (g/mi) MOBILES DET (g/mi/ 10k mi) Engine Start MOBILE6 ZML (grams) Engine Start MOBILE6 DET (g/lOkmi) Exhaust Running MOBILE6 ZML (g/mi) Exhaust Running MOBILE6 DET (g/mi/ 10k mi) Light Duty Gasoline Vehicles Pre-1968 1968-72 1973-74 1975-76 1977-79 1980 3.440 4.350 2.860 2.440 1.790 1.500 0.000 0.000 0.050 0.040 0.110 .0.102 0.721 2.085 6.777 2.979 2.453 0.753 0.000 0.000 0.078 0.049 0.151 0.051 3.127 3.824 2.079 1.906 1.373 1.319 0.000 0.000 0.036 0.031 0.084 0.090 Light Dut0.102y Gasoline Trucks (<6,000 Ibs. GVW) Pre-1968 1968-72 1973-74 1975-78 1979-80 3.440 4.350 2.870 2.700 1.770 0.000 0.000 0.040 0.030 0.060 0.275 0.348 0.230 0.216 0.142 0.000 0.000 0.003 0.002 0.005 2.890 3.564 2.411 2.28 1.522 0.000 0.000 0.034 0.025 0.052 Light Duty Gasoline Trucks (6,001-8500 Ibs. GVW) Pre-1970 1970-73 1974-78 1979-80 5.440 6.450 4.610 1.770 0.000 0.000 0.040 0.060 1.630 1.932 1.381 1.326 0.000 0.000 0.030 0.045 4.733 5.612 4.011 1.434 0.000 0.000 0.035 0.049 DRAFT M6.EXH.005 22 May 5, 1999 ------- Table 8 Calculated MOBILE6 Basic Exhaust Emission Rates for Oxides of Nitrogen (NOx) Low Altitude Motorcycles, Light Duty Diesel Vehicles and Light Duty Diesel Trucks Model Years MOBILES ZML (g/mi) MOBILES DET (g/mi/ 10k mi) Engine Start MOBILE6 ZML (grams) Engine Start MOBILE6 DET (g/lOkmi) Exhaust Running MOBILE6 ZML (g/mi) Exhaust Running MOBILE6 DET (g/mi/ 10k mi) Motorcycles Pre-1978 1978-79 1980+ 0.250 0.680 0.850 0.030 0.000 0.000 0.269 0.733 0.916 0.032 0.000 0.000 0.190 0.517 0.647 0.023 0.000 0.000 Light Duty Diesel Vehicles Pre-1975 1975-80 1981-84 1985+ 1.460 1.400 1.310 0.870 0.040 0.040 0.030 0.030 0.055 0.053 0.050 0.033 0.002 0.002 0.001 0.001 1.461 1.400 1.310 0.870 0.040 0.040 0.030 0.030 Light Duty Diesel Trucks Pre_1978 1978-80 1981-7 1988-89 1990+ 1.830 1.830 1.480 1.070 1.030 0.080 0.080 0.030 0.030 0.030 0.069 0.069 0.055 0.040 0.039 0.003 0.003 0.001 0.001 0.001 1.830 1.830 1.480 1.070 1.030 0.080 0.080 0.030 0.030 0.030 DRAFT M6.EXH.005 23 May 5, 1999 ------- Table 9 Calculated MOBILE6 Basic Exhaust Emission Rates for Total Hydrocarbons (THC) High Altitude Light Duty Gasoline Vehicles and Trucks Model Years MOBILES ZML (g/mi) MOBILES DET (g/mi/ 10k mi) Engine Start MOBILE6 ZML (grams) Engine Start MOBILE6 DET (g/lOkmi) Exhaust Running MOBILE6 ZML (g/mi) Exhaust Running MOBILE6 DET (g/mi/ 10k mi) Light Duty Gasoline Vehicles Pre-1968 1968-69 1970-71 1972-74 1975-76 1977 1978-79 1980 9.350 5.600 4.580 4.620 2.000 0.930 2.080 0.780 0.018 0.025 0.037 0.016 0.028 0.028 0.028 0.205 8.544 6.711 5.626 3.668 2.622 2.278 3.396 2.366 0.164 0.300 0.454 0.127 0.367 0.686 0.457 0.622 7.761 4.396 3.559 3.738 1.492 0.552 1.491 0.399 0.149 0.196 0.287 0.129 0.209 0.166 0.201 0.105 Light Duty Gasoline Trucks (<6,000 Ibs. GVW) Pre-1968 1968-69 1970-71 1972-74 1975-78 1979-80 9.350 5.600 4.580 4.580 3.400 1.660 0.180 0.250 0.370 0.170 0.270 0.280 14.707 8.808 7.204 7.204 5.348 2.362 0.256 0.356 0.527 0.242 0.384 0.398 6.639 3.976 3.252 3.252 2.414 1.212 0.128 0.176 0.263 0.121 0.192 0.197 Light Duty Gasoline Trucks (6,001-8500 Ibs. GVW) Pre-1970 1970-73 1974-78 1979-80 12.350 8.560 8.560 1.660 0.180 0.250 0.170 0.280 14.169 9.821 9.821 5.052 0.207 0.287 0.195 0.852 9.880 6.848 0.848 0.780 0.144 0.200 0.136 0.132 DRAFT M6.EXH.005 24 May 5, 1999 ------- Table 10 Calculated MOBILE6 Basic Exhaust Emission Rates for Total Hydrocarbons (THC) High Altitude Motorcycles, Light Duty Diesel Vehicles and Light Duty Diesel Trucks Model Years MOBILES ZML (g/mi) MOBILES DET (g/mi/ 10k mi) Engine Start MOBILE6 ZML (grams) Engine Start MOBILE6 DET (g/lOkmi) Exhaust Running MOBILE6 ZML (g/mi) Exhaust Running MOBILE6 DET (g/mi/ 10k mi) Motorcycles Pre-1978 1978-79 1980-81 1982-84 1985-87 1988+ 11.430 3.020 2.950 2.520 2.000 1.840 0.750 1.440 1.150 0.950 0.750 0.700 10.273 2.714 2.651 2.265 1.798 1.654 0.674 1.294 1.034 0.854 0.674 0.629 9.041 2.389 2.333 1.993 1.582 1.455 0.593 1.139 0.910 0.751 0.593 0.554 Light Duty Diesel Vehicles Pre-1975 1975-79 1980-81 1982-83 1984+ 3.010 0.970 0.670 0.400 0.290 0.080 0.070 0.030 0.030 0.030 2.119 0.683 0.472 0.282 0.204 0.056 0.049 0.021 0.021 0.021 2.501 0.806 0.557 0.332 0.241 0.066 0.058 0.025 0.025 0.025 Light Duty Diesel Trucks Pre-1978 1978-80 1981+ 1.976 1.976 0.988 0.800 0.800 0.400 1.391 1.391 0.696 0.563 0.563 0.282 1.642 1.642 0.821 0.665 0.665 0.332 DRAFT M6.EXH.005 25 May 5, 1999 ------- Table 11 Calculated MOBILE6 Basic Exhaust Emission Rates for Carbon Monoxide (CO) High Altitude Light Duty Gasoline Vehicles and Trucks Model Years MOBILES ZML (g/mi) MOBILES DET (g/mi/ 10k mi) Engine Start MOBILE6 ZML (grams) Engine Start MOBILE6 DET (g/lOkmi) Exhaust Running MOBILE6 ZML (g/mi) Exhaust Running MOBILE6 DET (g/mi/ 10k mi) Light Duty Gasoline Vehicles Pre-1968 1968-69 1970-71 1972-74 1975-76 1977 1978-79 1980 117.700 85.540 79.640 75.680 47.030 19.630 41.830 22.800 2.250 2.550 3.130 2.350 2.460 2.460 2.460 1.958 182.486 152.485 144.950 108.834 85.598 49.255 87.726 59.770 3.488 4.546 5.697 3.379 4.477 6.173 5.159 5.133 70.149 49.186 45.156 46.165 26.572 9.678 22.212 10.511 1.341 1.466 1.775 1.434 1.390 1.213 1.306 0.903 Light Duty Gasoline Trucks (<6,000 Ibs. GVW) Pre-1968 1968-69 1970-71 1972-74 1975-78 1979-80 117.700 85.540 79.640 75.630 58.010 44.250 2.250 2.250 3.130 2.440 2.590 2.430 229.209 166.581 155.091 147.282 112.969 82.858 4.382 4.382 6.095 4.752 5.044 4.550 64.735 47.047 43.802 41.597 31.906 23.010 1.238 1.238 1.722 1.342 1.425 1.264 Light Duty Gasoline Trucks (6,001-8500 Ibs. GVW) Pre-1970 1970-73 1974-78 1979-80 141.350 107.720 107.720 44.249 2.250 2.550 2.440 2.430 243.504 185.569 185.569 195.541 3.876 4.393 4.203 7.098 86.224 65.709 65.709 16.372 1.373 1.556 1.488 0.899 DRAFT M6.EXH.005 26 May 5, 1999 ------- Table 12 Calculated MOBILE6 Basic Exhaust Emission Rates for Carbon Monoxide (CO) High Altitude Light Duty Diesel Vehicles and Trucks Model Years MOBILES ZML (g/mi) MOBILES DET (g/mi/ 10k mi) Engine Start MOBILE6 ZML (grams) Engine Start MOBILE6 DET (g/lOkmi) Exhaust Running MOBILE6 ZML (g/mi) Exhaust Running MOBILE6 DET (g/mi/ 10k mi) Light Duty Diesel Vehicles Pre-1975 1975-79 1980-83 1984+ 4.740 2.050 2.010 1.150 0.130 0.090 0.040 0.040 5.325 2.303 2.258 1.292 0.146 0.101 0.045 0.045 3.361 1.453 1.425 0.815 0.092 0.064 0.028 0.028 Light Duty Diesel Trucks Pre-1978 1978-80 1981+ 3.446 3.446 1.723 0.100 0.100 0.040 3.872 3.872 1.936 0.112 0.112 0.045 2.443 2.443 1.222 0.071 0.071 0.028 Motorcycles Pre-1978 1978-79 1980-81 1982+ 50.130 37.070 33.090 32.890 3.220 3.560 2.530 2.460 48.812 36.095 32.220 32.025 3.135 3.466 2.463 2.395 31.883 23.577 21.045 20.918 2.048 2.264 1.609 1.565 DRAFT M6.EXH.005 27 May 5, 1999 ------- Table 13 Calculated MOBILE6 Basic Exhaust Emission Rates for Oxides of Nitrogen (NOx) High Altitude Light Duty Gasoline Vehicles and Trucks Model Years MOBILES ZML (g/mi) MOBILES DET (g/mi/ 10k mi) Engine Start MOBILE6 ZML (grams) Engine Start MOBILE6 DET (g/lOkmi) Exhaust Running MOBILE6 ZML (g/mi) Exhaust Running MOBILE6 DET (g/mi/ 10k mi) Light Duty Gasoline Vehicles Pre-1968 1968-72 1973-74 1975-76 1977 1978-79 1980 1.960 2.910 1.920 1.700 1.370 0.970 0.820 0.000 0.000 0.050 0.040 0.110 0.110 0.102 0.426 1.548 3.408 2.916 3.653 1.017 0.550 0.000 0.000 0.089 0.069 0.293 0.115 0.069 1.766 2.543 1.363 1.226 0.827 0.774 0.699 0.000 0.000 0.036 0.029 0.066 0.088 0.087 Light Duty Gasoline Trucks (<6,000 Ibs. GVW) Prel968 1968-69 1970-71 1972-74 1975-78 1979-80 1.960 2.910 1.910 1.880 0.970 0.970 0.000 0.000 0.040 0.030 0.060 0.060 1.321 1.962 1.288 1.267 0.654 0.654 0.000 0.000 0.027 0.020 0.040 0.040 1.627 2.415 1.585 1.560 0.805 0.795 0.000 0.000 0.03 0.025 0.050 0.049 Light Duty Gasoline Trucks (6,001-8500 Ibs. GVW) Pre-1970 1970-73 1974-78 1979-80 3.100 4.320 3.070 0.970 0.000 0.000 0.040 0.060 0.697 0.971 0.690 0.944 0.000 0.000 0.009 0.058 2.697 3.758 2.671 0.407 0.000 0.000 0.035 0.049 DRAFT M6.EXH.005 28 May 5, 1999 ------- Table 14 Calculated MOBILE6 Basic Exhaust Emission Rates for Oxides of Nitrogen (NOx) High Altitude Motorcycles, Light Duty Diesel Vehicles and Light Duty Diesel Trucks Model Years MOBILES ZML (g/mi) MOBILES DET (g/mi/ 10k mi) Engine Start MOBILE6 ZML (grams) Engine Start MOBILE6 DET (g/lOkmi) Exhaust Running MOBILE6 ZML (g/mi) Exhaust Running MOBILE6 DET (g/mi/ 10k mi) Motorcycles Pre-1978 1978-79 1980+ 0.140 0.450 0.570 0.030 0.000 0.000 0.147 0.472 0.598 0.031 0.000 0.000 0.107 0.343 0.434 0.023 0.000 0.000 Light Duty Diesel Vehicles Pre-1975 1975-80 1981-84 1985+ 1.460 1.400 1.310 0.870 0.040 0.040 0.030 0.030 0.055 0.052 0.049 0.033 0.001 0.001 0.001 0.001 1.461 1.401 1.311 0.871 0.040 0.040 0.030 0.030 Light Duty Diesel Trucks Prel978 1978-80 1981-87 1988-89 1980+ 1.830 1.830 1.480 1.070 1.030 0.080 0.080 0.030 0.030 0.030 0.069 0.069 0.055 0.040 0.039 0.003 0.003 0.001 0.001 0.001 1.832 1.832 1.481 1.071 1.031 0.080 0.080 0.030 0.030 0.030 DRAFT M6.EXH.005 29 May 5, 1999 ------- |