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WHO Air Quality Guidelines and their rationale

http://whqlibdoc.who.int/hq/2006/WHO_SDE_PHE_OEH_06.02_eng.pdf

WHO Air Quality Guidelines and their rationale

Particulate matter

Guidelines

PM2.5: 10 μg/m3 annual mean

25 μg/m3 24-hour mean

PM10: 20 μg/m3 annual mean

50 μg/m3 24-hour mean

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