Acid Rain
United StatesPhysical EnvironmentAverage acidity of precipitation in the United States. Lower pH values represent greater acidity.
Geosystems: Intro to Physical Geography
A map shows the p H levels of acid rain in the U.S. States like Ohio and Pennsylvania have the lowest p H levels (4.50 to 4.59 p H, black). States like Arizona and Nevada show the highest p H levels (greater than or equals 5.30 p H, light yellow).
4.50–4.59 pH | 4.60–4.69 pH | 4.70–4.79 pH | 4.80–4.89 pH | 4.90–4.99 pH | 5.00–5.09 pH | 5.10–5.19 pH | 5.20–5.29 pH | ≥5.30 pH | Global Terrorist Attacks | Class | Rank | Metric tons | Value | very high (>300) | high (100–300) | medium (20–100) | low (2–20) | very low (<2) | high (100–300) | medium (20–100) | low–very low (<20) | very high–high (>100) | medium–very low (<100) | Oil Slicks (1990s) | |
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4.29% | 14.4% | 23.8% | 24.2% | 18.5% | 16.1% | 11.6% | 6.63% | 81.6% | 1 | 6.63% | 17.7% | 9.02% | 11.0% | 16.0% | 11.5% | 10.1% | 12.7% | 26.5% | 24.8% | 8.20% |
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