Evaluating Ozone Control Programs in the Eastern United States: Focus on the NOx Budget Trading Program, 2004 State and Local Information for EPA Region 6 Arkansas Louisiana U.S. Environmental Protection Agency Office of Air and Radiation Office of Air Quality Planning and Standards October 2005 ------- Arkansas Emissions State total emissions of NOx and VOCs have decreased from 1997 to 2004. Ozone Season (May-September) Emission Totals by Major Source Categories (tons) Source Category 1997 2002 2004 NOx Emissions Power Industry 21,680 18,238 18,506 Mobile On-Road 50,243 37,840 34,059 Other 67,407 44,796 49,643 VOC Emissions Mobile On-Road 34,815 21,678 19,535 Solvent Usage 33,878 35,063 32,791 Other 43,942 53,804 50,653 The emissions data used in the report are measured or estimated values from EPA's National Emissions Inventory (NEI). Starting in 1997, the NEI incorporated power industry data measured by the Continuous Emissions Monitoring System (CEMS). For 2002, the preliminary version of the NEI was used, which includes the 2002 CEMS data, but does not include 2002 data for other sources submitted by state, local, and tribal air agencies. EPA used CEMS data for the power industry for 2003 and 2004. Emissions for other sources for that period were estimated by interpolating between the 2002 preliminary NEI data and a projected 2010 emission inventory developed to support the Clean Air Interstate Rule. For additional information use the following online resources: National Emissions Inventory (NEI): www.epa.gov/ttn/chief/net. Emissions data for the power industry: http://cfpub.epa.gov/gdm . Information on mobile sources: www.epa.gov/otaq . ------- Ozone On average, ozone has declined between 1997 and 2004. These improvements in ozone are in response to both state and regional reductions in NOx and VOC emissions. The level of ozone improvement varies from site to site. Highest Fourth Daily Maximum 8-hour Ozone Concentration by Metropolitan Statistical Area, 1997, 2C )02 and 200^ Metropolitan Statistical Area 1997 03 8-hr (ppm) 2002 03 8-hr (ppm) 2004 03 8-hr (ppm) Little Rock—North Little Rock, AR MSA 0.08 0.09 0.07 Memphis, TN--AR--MS MSA 0.09 0.1 0.08 Level of the NAAQS is .08 ppm. Units are parts per million (ppm). Notes: • Data from exceptional events are not included. • The reader is cautioned that this summary is not adequate in itself to numerically rank MSAs according to their air quality. • The monitoring data represent the quality of air in the vicinity of the monitoring site and, for some pollutants, may not necessarily represent urban-wide air quality. ------- Louisiana Emissions State total emissions of NOx and VOCs have decreased from 1997 to 2004. After 2002 the largest emission reductions were NOx emissions from power generating sources. Ozone Season (May-September) Emission Totals by Major Source Categories (tons) Source Category 1997 2002 2004 NOx Emissions Power Industry 45,198 38,519 32,264 Mobile On-Road 60,410 50,642 45,408 Other 272,650 234,398 237,655 VOC Emissions Mobile On-Road 41,582 31,402 28,257 Solvent Usage 29,816 24,427 23,523 Other 106,822 80,057 76,585 The emissions data used in the report are measured or estimated values from EPA's National Emissions Inventory (NEI). Starting in 1997, the NEI incorporated power industry data measured by the Continuous Emissions Monitoring System (CEMS). For 2002, the preliminary version of the NEI was used, which includes the 2002 CEMS data, but does not include 2002 data for other sources submitted by state, local, and tribal air agencies. EPA used CEMS data for the power industry for 2003 and 2004. Emissions for other sources for that period were estimated by interpolating between the 2002 preliminary NEI data and a projected 2010 emission inventory developed to support the Clean Air Interstate Rule. For additional information use the following online resources: National Emissions Inventory (NEI): www.epa.gov/ttn/chief/net. Emissions data for the power industry: http://cfpub.epa.gov/gdm . Information on mobile sources: www.epa.gov/otaq . ------- Ozone On average, ozone has declined between 1997 and 2004. These improvements in ozone are in response to both state and regional reductions in NOx and VOC emissions. The level of ozone improvement varies from site to site. Highest Fourth Daily Maximum 8-hour Ozone Concentration by Metropolitan Statistical Area, 1997, 2C )02 and 200^ Metropolitan Statistical Area 1997 03 8-hr (ppm) 2002 03 8-hr (ppm) 2004 03 8-hr (ppm) Baton Rouge, LA MSA 0.1 0.08 0.09 Houma, LA MSA 0.08 0.07 0.08 Lafayette, LA MSA 0.08 0.07 0.08 Lake Charles, LA MSA 0.09 0.07 0.08 Monroe, LA MSA 0.07 0.08 0.07 New Orleans, LA MSA 0.08 0.08 0.08 Shreveport-Bossier City, LA MSA 0.08 0.08 0.07 Level of the NAAQS is .08 ppm. Units are parts per million (ppm). Notes: • Data from exceptional events are not included. • The reader is cautioned that this summary is not adequate in itself to numerically rank MSAs according to their air quality. • The monitoring data represent the quality of air in the vicinity of the monitoring site and, for some pollutants, may not necessarily represent urban-wide air quality. ------- |