TRANSPORTATION ENERGY DATA BOOK: EDITION 22 - Center for ...

4–12
Diesel vehicles are responsible for the majority of highway vehicle PM-2.5 emissions. More than
70% of the highway vehicles’ PM-2.5 emissions are from heavy diesel trucks.
Table 4.11
Emissions of Particulate Matter (PM-2.5) from Highway Vehicles, 1990–99 a
(thousand short tons)
Source category 1990 1995 1997 1998 1999
Percent
of total, 1999
Gasoline powered
Light vehicles & motorcycles 34 32 33 34 34 14.8%
Light trucksb 24 26 22 22 22 9.6%
Heavy vehicles 6 6 9 8 8 3.5%
Total 64 64
Diesel powered
64 64 64 27.9%
Light vehicles 6 6 2 1 1 0.4%
Light trucksb 12 2 1 1 1 0.4%
Heavy vehicles 204 165 196 179 164 71.6%
Total 222 173
Total
199 181 166 72.5%
Highway vehicle total 286 237 263 246 229 100.0%
Percent diesel 77.6% 73.0% 75.7% 73.6% 72.5%
Source:
U. S. Environmental Protection Agency, National Emission Inventory Air Pollutant Emission Trends website
www.epa.gov/ttn/chief/trends (Additional resources: www.epa.gov/oar/oaqps)
Note:
Detailed data tabulations for 2000 have not yet been released. Look for the 2000 Air Quality Trends Report on
the EPA website: http://www.epa.gov/airtrends/reports.html.
a The sums of subcategories may not equal total due to rounding.
b Less than 8,500 pounds.
TRANSPORTATION ENERGY DATA BOOK: EDITION 22—2002