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Dirt and Grime on Buildings Turn Into Smog When Exposed to Sunlight
The concentration of PM2.5 in Changchun, Jilin, reached 860 micrograms per cubic meter at 8 a.m. on Monday, Nov. 9.
Dirt and Grime on Buildings Turn Into Smog When Exposed to Sunlight

ByAna Verayo | Aug 18, 2015 06:28 AM EDT

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