Table 4-44: Estimated National Emissions of Particulate
Matter (PM-2.5)a
(Million short tons)
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7.96 |
7.74 |
7.65 |
7.33 |
7.98 |
7.18 |
R7.70 |
R8.06 |
R7.86 |
N |
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R0.29 |
0.29 |
0.28 |
0.26 |
0.26 |
R0.24 |
R0.28 |
R0.26 |
R0.25 |
0.23 |
0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
0.05 |
0.05 |
0.05 |
0.05 |
0.05 |
0.03 |
R0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
0.04 |
0.04 |
0.04 |
0.04 |
0.03 |
0.03 |
0.03 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
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1.69 |
1.68 |
1.64 |
1.72 |
1.71 |
1.56 |
R1.37 |
R1.43 |
R1.41 |
1.41 |
0.56 |
0.60 |
0.61 |
0.62 |
0.63 |
0.59 |
0.60 |
R0.65 |
R0.67 |
0.68 |
R2.68 |
2.71 |
2.67 |
2.75 |
2.75 |
R2.50 |
R2.38 |
R2.48 |
R2.46 |
2.46 |
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0.91 |
0.89 |
0.93 |
0.85 |
0.84 |
0.90 |
R0.85 |
R0.78 |
R0.74 |
0.77 |
0.56 |
0.57 |
0.58 |
0.50 |
0.50 |
0.50 |
R0.37 |
R0.38 |
0.39 |
0.39 |
0.23 |
0.24 |
0.24 |
0.29 |
0.27 |
0.25 |
0.23 |
0.24 |
0.24 |
0.53 |
3.59 |
3.32 |
3.22 |
2.95 |
3.62 |
3.04 |
R3.87 |
R4.19 |
R4.05 |
e2.63 |
5.29 |
5.02 |
4.97 |
4.59 |
5.23 |
4.69 |
R5.33 |
R5.59 |
R5.41 |
N |
KEY: N = data do not exist; R = revised.
a Particulate matter less than 2.5 microns in size.
b Other off-road comprises nonroad gasoline- and diesel-powered
recreational, airport service and railway maintenance vehicles and recreational
marine vessels.
c Industrial processes comprise chemical and allied
product manufacturing, metals processing, petroleum and related industries,
and other industrial processes; solvent utilization; and storage and transportation.
d Miscellaneous comprises nonroad gasoline- and diesel-powered
construction, industrial, lawn and garden, farm, light-commercial, logging vehicles
and other non-road sources; geogenic sources, agriculture and forestry, cooling
towers, nontransportation-related fugitive dust, wildfires, managed burning,
and other fugitive dust and combustion (that could not accurately be allocated
to specific source categories).
e Miscellaneous data for 1999 does not include emissions
from geogenic sources because the data was not estimated in 1999. The methodologies
used for obtaining geogenic emission data are still being improved and current
estimates will be revised at a later date.
NOTES: The emissions estimates shown here are those that
are directly emitted, which represent only a portion of the total PM-2.5 emissions
found in the air. Secondary formation of fine particulates resulting from emissions
of nitrogen oxide, sulfur dioxide, volatile organic compounds, and other substances
is also a significant source of PM-2.5.
Numbers may not add to totals due to rounding.
The methodologies used to estimate emissions constantly evolve
and undergo major changes. Improved methods are often used to revise estimates
for previous years. Therefore, some estimates in this table may not match estimates
produced in previous reports, and some trends may not be consistent across years
in which major changes in methodology have occurred.
SOURCES: 1990-99: U.S. Environmental Protection Agency,
National Air Quality and Emissions Trends Report: 1999 (EPA-454/R-01-004)
(Research Triangle Park, NC: March 2001), table A-9; available at Internet website
http://www.epa.gov/oar/aqtrnd99/toc.html,
as of Sept. 5, 2001.
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