Moving Science
fata Action

Peter Gabele, Office of Research and Development, [National Exposure Research Laboratory

Research Triangle Park, NC

Cumulative Exhaust Emissions

Ten Percent of the Cars Emit Most of the
Pollution In Cary, NC

Ascending Mileage

Mileage Effect

Note: The 16 vehicles
< 98K mi had emission
rates <20 mg/mi.

I 150

O)

£,

0)

jg 100

I

150K











270K



100K









X

L

/

.¦I l.-l . ¦

J

Li	

1 JiJ

.¦III

PM Emission Rates From 60 Cars Tested in Riverside, CA

Ascending Age >

Age Effect

Note: The 31 vehicles
<11 yr. had emission
rates <20 mg/mi.

13 yrs

m





V



32 yrs 1













11 yrs











ETC1 \











-< . . . ...

1

1. Ill

1



.1.

PWI Emission Rates From 60 Cars Tested in Riverside, CA

Air Toxic Results fi
Tested in Cary, NC

~ Winter
¦ Summer

"a 40

Updated mobile source emission models
> Tuned receptor models
Improved emission inventories for air toxic and other pollutants
Relevant exposure models
More focused regulatory decision-making

Transportable Dynamometer

- Cars recruited "on the spot" using incentives
Tests conducted with cars "as is"

> Comprehensive analyses performed on exhaust emissions yield emission rates for numerous pollutants

-	HC, CO, NOx. and CO,

-	PM2.5 (elements, EC/OC, ions)

-	SVOCs

-	Speciated HCs, aldehydes & ketones, oxygenates

-	Mobile source air toxics

Partnering to Protect Human

% Fleet S1
Emissions

% of Fleet

•	Emissions from gross emitters are characterized and quantified

-	PM 25, HC, CO, NOx, and C02

-	Gross emitters (an elusive source) contribute significantly to mobile source
pollution

•	Pollutants from gross emitters often have unique characteristics

•	Emission profiles specific to given regions are updated for use in receptor models

•	Emission rate distributions for sampled fleets are used to update emission models

Exhaust Transfer Tube
To Dilution Tunnel

-------