USA Air Quality Trends: 1970-2001
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ANNUAL SHORT TONS (000) |
1970 |
1980 |
1990 |
2000 |
2001 |
|
CO |
163,231 |
143,827 |
110,255 |
68,061 |
74,825 |
|
NOx |
12,624 |
11,493 |
9,592 |
8,394 |
8,249 |
|
VOC |
16,910 |
13,869 |
9,388 |
5,325 |
4,874 |
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PM 2.5 |
|
|
324 |
173 |
162 |
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PM 10 |
480 |
432 |
387 |
230 |
218 |
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RATES |
1970-2001 |
1990-2001 |
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Annual: 1970-1990 |
Annual: 1990-2001 |
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CO |
-54.2% |
-32.1% |
|
-3.82% |
-3.46% |
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NOx |
-34.7% |
-14.0% |
|
-2.11% |
-1.36% |
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VOC |
-71.2% |
-48.1% |
|
-6.03% |
-5.79% |
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PM 2.5 |
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-49.8% |
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-6.08% |
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PM 10 |
-54.5% |
-43.6% |
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-3.86% |
-5.07% |
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Source: |
http://www.epa.gov/ttn/chief/trends/index.html |
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Illustration: |
http://www.epa.gov/airtrends/2002_airtrends_final.pdf (page 4) |
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