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Table
4-44: Estimated National Emissions of Particulate Matter (PM-2.5)a
(Million short tons)
Excel | CSV
Total all sources |
7.56 |
7.32 |
7.20 |
7.15 |
7.54 |
6.93 |
6.73 |
6.26 |
6.26 |
(R)
7.33 |
(R)
7.29 |
(R)
6.63 |
6.80 |
Transportation,
total |
2.67 |
2.69 |
2.64 |
2.71 |
2.71 |
2.50 |
2.30 |
2.40 |
2.38 |
(R) 2.29 |
(R) 2.30 |
(R) 1.92 |
1.85 |
On-road
vehicles |
0.32 |
0.31 |
0.29 |
0.28 |
0.26 |
0.24 |
0.23 |
0.22 |
0.20 |
0.18 |
0.17 |
0.16 |
0.15 |
Aircraft |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
Railroads |
0.02 |
0.02 |
0.02 |
0.02 |
0.02 |
0.02 |
0.02 |
0.02 |
0.02 |
0.02 |
0.02 |
0.02 |
0.02 |
Marine
vessels |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
Other off-roadb |
0.03 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
Transportation-related
fugitive dust |
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Unpaved roads |
1.69 |
1.68 |
1.64 |
1.72 |
1.71 |
1.56 |
1.37 |
1.43 |
1.41 |
(R) 1.31 |
1.32 |
(R) 1.35 |
1.29 |
Paved roads |
0.56 |
0.60 |
0.61 |
0.62 |
0.63 |
0.58 |
0.60 |
0.65 |
0.67 |
(R) 0.69 |
0.71 |
(R) 0.31 |
0.31 |
Nontransportation,
total |
4.89 |
4.63 |
4.56 |
4.44 |
4.83 |
4.43 |
4.42 |
3.86 |
3.88 |
(R) 5.04 |
(R) 4.98 |
(R) 4.71 |
4.95 |
Fuel
combustion |
0.91 |
0.89 |
0.93 |
0.85 |
0.84 |
0.90 |
0.67 |
0.67 |
0.63 |
(R)
1.40 |
(R)
1.29 |
(R) 1.30 |
1.16 |
Industrial processesc |
0.56 |
0.57 |
0.58 |
0.50 |
0.50 |
0.50 |
0.37 |
0.38 |
0.39 |
0.49 |
0.50 |
(R) 0.59 |
0.42 |
Waste
disposal and recycling |
0.23 |
0.24 |
0.24 |
0.29 |
0.27 |
0.25 |
0.43 |
0.44 |
0.46 |
(R)
0.44 |
(R) 0.33 |
(R) 0.33 |
0.42 |
Miscellaneousd |
3.19 |
2.92 |
2.81 |
2.80 |
3.22 |
2.79 |
2.96 |
2.37 |
2.41 |
(R) 2.71 |
(R) 2.85 |
(R)
2.49 |
2.96 |
KEY: 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 comprises 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.
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. These improved methods are
often used to revise estimates for previous years and, therefore, some
estimates in this table may not match estimates produced in previous
reports.
SOURCE
1990-2002: U.S. Environmental Protection Agency,
Clearinghouse for Inventories and Emissions Factors (CHIEF), Current Emission Trends Summaries, Internet website http://www.epa.gov/ttn/chief/trends/ as of
Dec. 21, 2004.
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