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Table
4-41: Estimated National Emissions of
Nitrogen Oxides
(Million short tons)
Excel | CSV
| TOTAL |
26.88 |
26.38 |
27.08 |
25.76 |
25.53 |
25.18 |
25.26 |
25.36 |
25.35 |
24.96 |
24.79 |
24.71 |
24.35 |
22.84 |
22.60 |
21.55 |
21.14 |
20.33 |
19.52 |
18.71 |
17.69 |
17.03 |
| Highway
vehicles |
12.62 |
12.06 |
11.49 |
10.93 |
9.59 |
9.45 |
9.31 |
9.16 |
9.02 |
8.88 |
8.73 |
8.79 |
8.62 |
8.37 |
8.39 |
7.77 |
7.87 |
7.38 |
6.90 |
6.41 |
5.97 |
5.56 |
| Off-Highway |
2.65 |
2.97 |
3.35 |
3.58 |
3.78 |
3.85 |
3.92 |
3.98 |
4.05 |
4.11 |
4.18 |
4.18 |
4.16 |
4.08 |
4.17 |
4.16 |
4.51 |
4.47 |
4.44 |
4.40 |
4.27 |
4.16 |
| Fuel
combustion |
10.06 |
10.49 |
11.32 |
10.05 |
10.89 |
10.78 |
10.93 |
11.11 |
11.02 |
10.83 |
10.51 |
10.55 |
10.38 |
9.20 |
8.82 |
8.45 |
7.49 |
7.20 |
6.92 |
6.63 |
6.17 |
6.00 |
| Industrial processesa |
0.78 |
0.54 |
0.56 |
0.80 |
0.80 |
0.72 |
0.76 |
0.74 |
0.77 |
0.77 |
0.80 |
0.84 |
0.85 |
0.78 |
0.81 |
0.85 |
0.95 |
0.95 |
0.95 |
0.95 |
0.93 |
0.92 |
| Waste
disposal and recycling |
0.44 |
0.16 |
0.11 |
0.09 |
0.10 |
0.10 |
0.10 |
0.12 |
0.11 |
0.10 |
0.16 |
0.16 |
0.16 |
0.16 |
0.13 |
0.13 |
0.11 |
0.11 |
0.11 |
0.11 |
0.11 |
0.11 |
| Miscellaneous |
0.33 |
0.17 |
0.25 |
0.31 |
0.37 |
0.29 |
0.26 |
0.24 |
0.39 |
0.27 |
0.41 |
0.19 |
0.18 |
0.25 |
0.28 |
0.18 |
0.21 |
0.21 |
0.21 |
0.21 |
0.24 |
0.26 |
Key: R = revised.
a Industrial processes consists of chemical
and allied product manufacturing, metals processing, petroleum and related
industries, and other industrial processes; and solvent utilization, storage,
and transport.
SOURCE
U.S. Environmental Protection Agency, Clearinghouse for
Inventories and Emissions Factors (CHIEF), Current
Emission Trends Summaries, available at
http://www.epa.gov/ttn/chief/trends/index.html as of December 2008.
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