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Chemistry and Human Environment_Ridge_Date_021610

Chemistry and Human Environment_Ridge_Date_021610 - Air...

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Air Pollution II: Where does air pollution come from? How can it be reduced? Clean Air Act - 1970 (Amendments in 1990 and 1997) Criteria pollutants o Regulated by first developing health-based criteria as the basis for setting permissible levels o Each state must develop an implementation plan (SIP) to achieve National Ambient Air Quality Standards (NAAQS) Hazardous Air Pollutants o Known to cause cancer and/or other major health effects o Regulation based on “Maximum Available Control Technology (MACT)”, i.e. reducing levels as much as is technologically and economically feasible Revisions to Criteria Pollutant Standards 1987: PM10 replaces Total Suspended Particulates 1997: PM2.5 standard added; PM10 standard retained 2008: PM standards under final review o PM2.5 daily average set to 35 ug/m3 o PM10 standard removed o PM coarse(2.5-10 um size) set to 70ug/m3 New PM2.5 Standard: How low is low enough? Health effects scale with exposure Health studies suggest that each 1 ug/m3 reduction in PM2.5 will prevent 25,000 premature deaths worldwide
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There is no such thing as zero exposure What is a low enough exposure? (Cost-Benefit) Past and Future PM2.5 standards: o Current US standard (annual avg.): 15 ug/m3 o World Health Organization recommendation: 10 ug/m3 o American Lung Association recommendation: 12 ug/m3 o
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Chemistry and Human Environment_Ridge_Date_021610 - Air...

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