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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 |
22.27 |
22.69 |
22.81 |
23.08 |
22.38 |
22.08 |
21.77 |
21.35 |
18.62 |
18.39 |
18.84 |
18.94 |
(R) 17.55 |
(R) 16.35 |
(R)
15.93 |
15.35 |
| Transportation,
total |
0.51 |
0.57 |
0.63 |
0.69 |
0.71 |
0.72 |
0.72 |
0.73 |
0.73 |
0.70 |
0.67 |
0.63 |
0.60 |
0.56 |
0.53 |
0.54 |
0.53 |
0.54 |
0.49 |
(R) 0.47 |
0.49 |
| On-road
vehicles |
0.27 |
0.33 |
0.39 |
0.46 |
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 |
(R)
0.25 |
0.28 |
| 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 |
(R) 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 |
<0.01 |
| Railroads |
0.08 |
0.07 |
0.07 |
0.06 |
0.06 |
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 |
0.06 |
0.05 |
| Marine vessels |
0.16 |
0.16 |
0.16 |
0.17 |
0.18 |
0.18 |
0.18 |
0.17 |
0.17 |
0.17 |
0.17 |
0.16 |
0.16 |
0.16 |
0.16 |
0.17 |
0.17 |
0.18 |
0.16 |
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 |
18.30 |
18.41 |
(R) 17.00 |
(R)
15.86 |
(R)
15.46 |
14.86 |
| Fuel
combustion |
23.46 |
22.66 |
21.39 |
20.02 |
19.43 |
19.43 |
19.76 |
19.92 |
20.29 |
19.80 |
19.49 |
19.25 |
18.89 |
16.23 |
16.25 |
16.65 |
16.74 |
(R) 15.34 |
(R)
14.16 |
(R) 13.74 |
13.17 |
| Industrial processesa |
7.09 |
4.68 |
3.77 |
2.43 |
2.22 |
1.94 |
2.02 |
1.98 |
1.86 |
1.68 |
1.72 |
1.65 |
1.62 |
1.59 |
1.37 |
1.43 |
1.43 |
(R)
1.33 |
(R) 1.38 |
(R)
1.43 |
1.37 |
| Waste
disposal and recycling |
0.01 |
0.05 |
0.03 |
0.03 |
0.04 |
0.04 |
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 |
0.03 |
| 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 |
(R)
0.30 |
(R) 0.28 |
(R) 0.26 |
0.30 |
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.
Numbers may
not add to totals due to rounding.
SOURCE
1970-2002: 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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