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

The transportation sector accounted for only 3% of the nation’s particulate matter (PM-10)
emissions in 1999. For details on the highway emissions of PM-10, see Table 4.9.
Table 4.8
Total National Emissions of Particulate Matter (PM-10), 1970–99 a
(million short tons)
Source category 1970 1980 1990 1995 1998 1999
Highway vehicles
Off-highway
0.44
0.22
0.40
0.40
0.35
0.49
0.30
0.46
0.31
0.47
aFine particle matter less than 10 microns. The sums of subcategories may not equal total due
to rounding.
TRANSPORTATION ENERGY DATA BOOK: EDITION 22—2002
0.30
0.46
Percent
of total,
1999
1.2%
1.9%
Transportation total
Stationary fuel combustion
0.66 0.80 0.84 0.76 0.78 0.75 3.2%
total 2.87 2.45 1.20 1.18 1.00 1.03 4.3%
Industrial processes total
Waste disposal and
7.67 2.75 1.04 0.95 0.67 0.68 2.9%
recycling total 1.00 0.27 0.27 0.29 0.31 0.59 2.5%
Miscellaneous total 0.84 0.85 24.54 22.77 23.28 20.63 87.1%
Total of all sources 13.04 7.12 27.88 25.93 26.04 23.68 100.0%
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.
Emission estimation methodology changes indicated by shaded areas. Transportation methodologies
changed in 1970, while all others changed in 1990.
4–9