Table 4-41: Estimated National Emissions of Nitrogen Oxides (Million short
tons)
Excel | CSV
| 20.93 |
22.65 |
24.39 |
23.20 |
22.81 |
23.07 |
24.13 |
23.89 |
24.17 |
R24.35 |
24.74 |
25.11 |
25.49 |
25.06 |
R26.07 |
R26.36 |
R26.01 |
R25.44 |
24.90 |
| 8.17 |
9.58 |
9.97 |
9.64 |
9.38 |
9.33 |
9.46 |
9.56 |
9.32 |
R9.72 |
9.90 |
10.06 |
10.30 |
10.14 |
R11.25 |
R11.43 |
R11.31 |
R11.13 |
10.66 |
| 7.39 |
8.65 |
8.62 |
8.09 |
7.77 |
7.65 |
7.66 |
7.68 |
7.21 |
7.56 |
7.76 |
7.96 |
8.18 |
7.96 |
8.79 |
8.92 |
8.82 |
R8.61 |
8.15 |
| 0.78 |
0.93 |
1.35 |
1.55 |
1.61 |
1.68 |
1.80 |
1.88 |
2.11 |
2.17 |
2.14 |
2.10 |
2.12 |
2.18 |
2.45 |
2.49 |
2.50 |
2.51 |
2.51 |
| 0.07 |
0.09 |
0.11 |
0.12 |
0.12 |
0.13 |
0.13 |
0.14 |
0.16 |
0.16 |
0.16 |
0.16 |
0.16 |
0.17 |
R0.08 |
R0.08 |
R0.08 |
R0.08 |
0.08 |
| 0.50 |
0.59 |
0.73 |
0.81 |
0.83 |
0.85 |
0.90 |
0.92 |
0.93 |
0.93 |
0.95 |
0.95 |
0.95 |
0.99 |
1.18 |
1.22 |
1.22 |
R1.24 |
1.23 |
| 0.17 |
0.21 |
0.47 |
0.56 |
0.60 |
0.63 |
0.70 |
0.75 |
0.94 |
1.00 |
0.96 |
0.92 |
0.93 |
0.94 |
R1.08 |
R1.08 |
R1.08 |
R1.08 |
1.09 |
| 0.04 |
0.04 |
0.04 |
0.06 |
0.06 |
0.07 |
0.07 |
0.07 |
0.08 |
0.08 |
0.08 |
0.08 |
0.08 |
0.08 |
R0.11 |
R0.11 |
R0.12 |
R0.11 |
0.11 |
| 12.77 |
13.07 |
14.42 |
13.56 |
13.43 |
13.74 |
14.67 |
14.33 |
14.85 |
14.63 |
14.84 |
15.05 |
15.19 |
14.92 |
R14.81 |
R14.93 |
R14.70 |
R14.31 |
14.24 |
| 10.06 |
10.49 |
11.32 |
10.05 |
9.87 |
10.01 |
10.47 |
10.54 |
10.89 |
10.78 |
10.93 |
11.11 |
11.02 |
10.83 |
R10.50 |
R10.56 |
R10.39 |
R9.96 |
9.65 |
| 0.78 |
0.54 |
0.56 |
0.80 |
0.79 |
0.76 |
0.78 |
0.77 |
0.80 |
0.72 |
0.76 |
0.74 |
0.77 |
0.77 |
0.80 |
0.84 |
0.85 |
0.85 |
0.88 |
| 0.44 |
0.16 |
0.11 |
0.09 |
0.09 |
0.09 |
0.09 |
0.08 |
0.09 |
0.10 |
0.10 |
0.12 |
0.11 |
0.10 |
R0.09 |
R0.09 |
R0.09 |
0.09 |
0.09 |
| 1.49 |
1.88 |
2.43 |
2.62 |
2.68 |
2.88 |
3.33 |
2.94 |
3.07 |
3.03 |
3.05 |
3.08 |
3.29 |
3.22 |
3.42 |
3.45 |
3.38 |
R3.42 |
3.62 |
KEY: R = revised.
a Other off-road comprises nonroad gasoline- and diesel-powered
recreational, airport service and railway maintenance vehicles, and recreational
marine vessels.
b Industrial processes comprises chemical and allied product manufacturing,
metals processing, petroleum and related industries, and other industrial processes;
and solvent utilization, storage, and transport.
c Miscellaneous comprises nonroad gasoline- and diesel-powered
construction, industrial, lawn and garden, farm, light-commercial, logging vehicles,
and other nonroad sources; health services, cooling towers, fugitive dust; and
other combustion sources that could not be accurately allocated to specific
source categories.
NOTES
The methodologies used to estimate emissions constantly evolve and undergo
major changes. These 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.
Numbers may not add to totals due to rounding.
SOURCES
1970, 1975: 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-2; available at Internet website http://www.epa.gov/oar/aqtrnd99/toc.html
as of Sept. 5, 2001.
1980, 1985 and 1989-2000: Ibid, Current Emission Trends Summaries, available
at internet website http://www.epa.gov/ttn/chief/trends/trends00/trends2000.pdf
as of Oct. 17, 2002.
1986-87: Ibid, National Emission Trends source reports database; available
at Internet website www.epa.gov/air/data/nettier.html as of Sept. 5, 2001.
1988: Ibid, National Air Pollutant Emission Trends: 1900-1998 (EPA-454/R-00-002)
(Research Triangle Park, NC: March 2000), table A-2; available at Internet website
http://www.epa.gov/ttn/chief/trends/trends98/browse.html as of Sept. 5, 2001.
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