Table 4-45: Estimated National Emissions of Sulfur Dioxide
(Million short tons)
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0.41 |
0.50 |
0.52 |
0.52 |
R0.56 |
0.57 |
0.59 |
0.53 |
0.31 |
R0.31 |
R0.34 |
R0.35 |
R0.36 |
0.36 |
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<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 |
0.04 |
0.04 |
0.05 |
0.06 |
0.12 |
0.12 |
0.13 |
0.12 |
0.11 |
0.11 |
0.11 |
0.12 |
0.11 |
0.11 |
0.04 |
0.05 |
0.12 |
0.14 |
0.25 |
0.26 |
0.26 |
0.25 |
0.25 |
0.24 |
0.24 |
0.25 |
0.26 |
0.27 |
0.49 |
0.59 |
0.70 |
0.73 |
R0.94 |
0.96 |
0.98 |
0.90 |
0.68 |
R0.67 |
R0.70 |
R0.72 |
R0.74 |
0.76 |
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23.46 |
22.66 |
21.39 |
20.02 |
20.29 |
19.80 |
19.49 |
19.25 |
18.89 |
16.23 |
R16.23 |
R16.65 |
R16.75 |
16.36 |
7.09 |
4.68 |
3.77 |
2.43 |
1.86 |
1.68 |
1.72 |
1.65 |
1.62 |
1.59 |
R1.38 |
R1.43 |
R1.43 |
1.43 |
0.01 |
0.05 |
0.03 |
0.03 |
0.04 |
0.04 |
0.04 |
0.07 |
0.06 |
0.05 |
0.04 |
0.04 |
0.04 |
0.04 |
0.11 |
0.02 |
0.01 |
0.44 |
0.55 |
0.56 |
0.58 |
0.61 |
0.63 |
0.65 |
R0.51 |
R0.52 |
R0.53 |
0.55 |
30.67 |
27.41 |
25.20 |
22.92 |
22.74 |
22.08 |
21.83 |
21.57 |
21.19 |
18.52 |
R18.16 |
R18.64 |
R18.75 |
18.38 |
31.16 |
28.01 |
25.91 |
23.66 |
R23.68 |
23.04 |
22.81 |
22.48 |
21.88 |
R19.19 |
R18.86 |
R19.36 |
R19.49 |
19.14 |
KEY: R = revised.
a Industrial processes comprise 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, 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. 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 methodology changes have occurred.
Numbers may not add to totals due to rounding.
SOURCES: 1970-85, 1989-99: 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-8; available at Internet website
http://www.epa.gov/oar/aqtrnd99/toc.html,
as of Sep. 5, 2001.
1988: Ibid, National Air Pollutant Emission Trends: 1900-1998
(EPA-454/R-00-002) (Research Triangle Park, NC: March 2000), table A-4; available
at Internet website http://www.epa.gov/ttn/chief/trends/trends98/browse.html,
as of Sep. 5, 2001.
1986-87: Ibid, National Emission Trends source reports database,
available at Internet website www.epa.gov/air/data/nettier.html,
as of Sep. 5, 2001.
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