Table
4-41: Estimated National Emissions of
Nitrogen Oxides
(Million short tons)
Excel | CSV
TOTAL
all sources |
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 |
21.28 |
20.48 |
19.56 |
18.95 |
18.23 |
Highway
vehicles |
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 |
8.13 |
7.75 |
(R)
7.37 |
6.98 |
(R)
6.60 |
7.37 |
Off-Highway |
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 |
4.39 |
(R)
4.27 |
4.14 |
(R) 4.02 |
2.07 |
Fuel
combustion |
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 |
7.40 |
7.12 |
(R) 6.73 |
(R) 6.63 |
(R) 6.43 |
6.43 |
Industrial processesa |
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 |
0.94 |
0.93 |
(R) 0.91 |
(R) 0.90 |
(R) 0.89 |
0.89 |
Waste
disposal and recycling |
0.16 |
0.11 |
0.09 |
0.09 |
0.10 |
0.10 |
0.12 |
0.11 |
0.10 |
0.15 |
0.16 |
0.16 |
0.16 |
0.13 |
0.13 |
0.11 |
0.11 |
(R)
0.11 |
(R)
0.11 |
(R)
0.11 |
0.11 |
Miscellaneousb |
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 |
0.18 |
0.18 |
(R) 0.18 |
(R) 0.18 |
(R)
0.18 |
0.183 |
KEY: R = revised.
a Industrial processes comprises chemical and
allied product manufacturing, metals processing, petroleum and related
industries, and other industrial processes; and solvent utilization, storage,
and transport.
b Miscellaneous
comprises nonroad gasoline- and diesel-powered construction, industrial, lawn
and garden, farm, light-commercial, logging vehicles, and other nonroad
sources; agriculture and forestry, health services, cooling towers, fugitive
dust; and other combustion sources that could not be accurately allocated to
specific source categories.
NOTE
Previous edition's data include all on road mobile sources and
some nonroad mobile sources, since EPA changed the methodology to estimate
emissions, the details of the data are not available, this data set only
contains the on road mobile sources.
SOURCE
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/index.html as of July 2007.
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