U.S. Geological Survey Open-File Report 09-0346
Trends in Precipitation Chemistry in the United States,
1983-1994: An Analysis of the Effects in 1995 of Phase I of the Clean Air Act Amendments of 1990, Title IV
Table 3. Coincidence of significantly
(p<0.05) decreasing sulfate concen-
trations with significantly
decreasing hydrogen ion concen-
trations from 1983 through 1994.
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| Region Site p(SO4) p(H) |
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| NE wi28 0.0001 0.0013 |
| ny10 0.0001 0.0056 |
| wv04 0.0001 0.0067 |
| in20 0.0003 |
| mi26 0.0004 0.0364 |
| wi37 0.0025 |
| ny52 0.0031 0.0055 |
| mi99 0.0039 |
| mi09 0.0040 0.0302 |
| ky22 0.0052 0.0422 |
| il19 0.0055 0.0163 |
| ny98 0.0075 0.0205 |
| mi98 0.0127 0.0057 |
| pa15 0.0146 0.0029 |
| wi99 0.0216 |
| va28 0.0235 0.0491 |
| wi36 0.0283 |
| il11 0.0318 0.0223 |
| in41 0.0366 0.0321 |
| il63 0.0367 |
| mi53 0.0406 0.0211 |
| me98 0.0417 |
| in34 0.0437 0.0013 |
| |
| 16 of 23 sites (70%) |
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| SE ms10 0.0035 |
| nc25 0.0083 |
| tn00 0.0100 |
| al10 0.0196 |
| ms30 0.0251 |
| nc03 0.0314 |
| |
| 0 of 6 sites (0%) |
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| West wy02 0.0001 0.0001 |
| or10 0.0001 |
| mn16 0.0003 |
| ca45 0.0005 0.0347 |
| co98 0.0005 |
| mo03 0.0006 0.0068 |
| mt05 0.0006 |
| az99 0.0007 0.0002 |
| ar27 0.0019 |
| ca98 0.0025 |
| nm07 0.0025 |
| mn18 0.0035 |
| co19 0.0036 |
| nm09 0.0037 0.0104 |
| az03 0.0040 |
| co22 0.0047 0.0154 |
| or02 0.0057 |
| or97 0.0064 0.0066 |
| co99 0.0081 |
| mn27 0.0084 |
| ca88 0.0162 0.0493 |
| nd11 0.0196 |
| co00 0.0208 |
| wy99 0.0218 |
| la12 0.0230 |
| nd07 0.0306 |
| ne15 0.0326 0.0287 |
| or98 0.0385 |
| ca42 0.0429 0.0044 |
| la30 0.0453 |
| |
| 10 of 30 sites (33%) |
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| 26 of 39 sites with decreasing H+ also |
| had decreasing SO42- |
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| 26 of 59 sites with decreasing SO42- |
| also had decreasing H+ |
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Last Update: 1536 08JUL96 kjl