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Table 4-45: Estimated National Emissions of Sulfur Dioxide (Million short
tons)
Excel | CSV
| Total all sources |
31.22 |
28.04 |
25.93 |
23.31 |
22.52 |
22.26 |
22.69 |
22.81 |
23.08 |
22.38 |
22.08 |
21.77 |
21.35 |
18.62 |
18.39 |
18.84 |
18.95 |
17.65 |
16.32 |
15.79 |
| Transportation, total |
0.51 |
0.57 |
0.63 |
0.69 |
0.71 |
0.72 |
0.72 |
0.73 |
0.73 |
0.70 |
0.66 |
0.63 |
0.60 |
0.56 |
0.53 |
0.53 |
0.53 |
0.54 |
0.49 |
0.49 |
| On-road vehicles |
0.27 |
0.33 |
0.39 |
0.45 |
0.47 |
0.48 |
0.49 |
0.50 |
0.50 |
0.47 |
0.44 |
0.40 |
0.37 |
0.34 |
0.30 |
0.30 |
0.30 |
0.30 |
0.26 |
0.26 |
| Off-road, total |
0.24 |
0.24 |
0.24 |
0.24 |
0.24 |
0.24 |
0.24 |
0.23 |
0.23 |
0.23 |
0.23 |
0.23 |
0.23 |
0.23 |
0.23 |
0.23 |
0.23 |
0.24 |
0.23 |
0.22 |
| 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 |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
<0.01 |
| Railroads |
0.07 |
0.07 |
0.07 |
0.06 |
0.06 |
0.05 |
0.05 |
0.05 |
0.06 |
0.06 |
0.06 |
0.06 |
0.06 |
0.06 |
0.06 |
0.06 |
0.06 |
0.06 |
0.06 |
0.06 |
| Marine vessels |
0.16 |
0.16 |
0.16 |
0.17 |
0.18 |
0.18 |
0.18 |
0.17 |
0.17 |
0.17 |
0.16 |
0.16 |
0.16 |
0.16 |
0.16 |
0.16 |
0.17 |
0.18 |
0.16 |
0.16 |
| Nontransportation, total |
30.70 |
27.47 |
25.30 |
22.61 |
21.81 |
21.54 |
21.97 |
22.08 |
22.34 |
21.68 |
21.42 |
21.14 |
20.75 |
18.06 |
17.86 |
18.31 |
18.41 |
17.11 |
15.83 |
15.30 |
| Fuel combustion |
23.46 |
22.66 |
21.39 |
20.02 |
19.43 |
19.43 |
19.76 |
19.92 |
20.29 |
19.80 |
19.49 |
19.24 |
18.89 |
16.23 |
16.25 |
16.65 |
16.75 |
15.51 |
14.20 |
13.63 |
| Industrial processesa |
7.09 |
4.68 |
3.77 |
2.43 |
2.22 |
1.94 |
2.02 |
1.97 |
1.86 |
1.68 |
1.71 |
1.65 |
1.62 |
1.59 |
1.37 |
1.43 |
1.43 |
1.32 |
1.36 |
1.41 |
| Waste disposal and recycling |
<0.01 |
0.05 |
0.03 |
0.03 |
0.04 |
0.03 |
0.04 |
0.04 |
0.04 |
0.04 |
0.04 |
0.07 |
0.06 |
0.05 |
0.03 |
0.03 |
0.03 |
0.03 |
0.03 |
0.04 |
| Miscellaneousb |
0.15 |
0.08 |
0.10 |
0.13 |
0.13 |
0.14 |
0.16 |
0.15 |
0.15 |
0.16 |
0.17 |
0.17 |
0.19 |
0.19 |
0.20 |
0.20 |
0.20 |
0.24 |
0.23 |
0.23 |
KEY: R = revised.
a Industrial processes comprises chemical and allied product manufacturing, metals
processing, petroleum and related industries, and other industrial processes; solvent
utilization; and storage and transport.
b Miscellaneous comprises nontransportation-related fugitive dust, agriculture and forestry,
nonroad gasoline, nonroad diesel, other nonroad sources and other miscellaneous combustion 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 and, therefore, some estimates in this table may not match
estimates produced in previous reports. The most recent revision of these estimates
is based on Version 2 of the 1999 National Emissions Inventory (NEI) and provides
a generally consistent time trend of the estimates. However, state-submitted
data on mobile sources is only reflected in the estimates for 1999 and the EPA
plans to correct this inconsistency in future publications.
Numbers may not add to totals due to rounding.
SOURCE
1970-2001: U.S. Environmental Protection Agency, Clearinghouse for Inventories and Emissions Factors
(CHIEF), Current Emission Trends Summaries, available at Internet website
http://www.epa.gov/ttn/chief/trends/
as of Aug. 14, 2003.
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