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21 - Lecture 21 Air Pollutants and Acid Rain 1 CLIMATE...

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1 Lecture 21: Air, Pollutants, and Acid Rain 1. CLIMATE versus WEATHER 2. Parts of the atmosphere & other definitions 3. Major USA laws 4. Acid precipitation 5. “Clean skies initiative” 6. Air pollution control Clean Air Act Revision (1990) - Included provisions for: – _____________ – Urban Smog – Toxic Air Pollutants – ________________________ – Marketing ________________ – Fugitive emissions of volatile organics – Ambient ozone, soot, and dust – _________ emissions 1990 AMENDMENT, con’t. Passed into law in 1990 (President George H.W. Bush) But still being implemented now. 1) Cut auto emissions 30-60% 2) Set cleaner fuel standards in cities with worst air. 3) Reduce sulfur dioxide 60% 4) Phase out CFCs Supreme Court: _______________ pH SCALE RANGES FROM 0-14 HIGH NUMBERS = _____________ “7” (MIDDLE OF SCALE) = ________ LOW NUMBERS = ______________ SOURCES
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2 Acid Deposition Acid precipitation - Deposition of wet, acidic solutions or dry, acidic particles from the air – Unpolluted rain generally has pH of 5.6 – In industrialized areas, human-generated acids in the air often outweigh natural
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