Episodic 24-hr PM2.5 Exceedance Map
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Areas where 24-hour fine particulate matter (PM2.5) levels exceeded the federal standard (35 mg/ m3) during three recent winters (2010-2012).
创建时间：
2022-04-21
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Areas where 24-hour fine particulate matter (PM2.5) levels exceeded the federal standard (35 mg/ m3) during three recent winters (2010-2012).