Chiang Mai Journal of Science

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Mass concentrations (μg/m³) of indoor and outdoor air particulate matter samples (PM2.5) were measured in residential and workplace buildings within the Chiang Mai urban area from June 2004 to May 2005. Twenty-four hour PM2.5 samples were collected each day with Airmetric Minivol® portable air samplers. The monthly averages for indoor PM2.5 mass concentration of residential and workplace buildings ranged from 13.6 to 57.9 μg/m³, and 9.9 to 58.5 μg/m³, respectively. The corresponding monthly averages for mass concentration of outdoor PM2.5 of two sampling sites ranged from 12.6 to 77.0 μg/m³, and 15.1 to 70.0 μg/m³. The mass concentrations of indoor and outdoor PM2.5 annual averages in residential buildings (RB) were 29.4 and 36.9 μg/m³, and in workplace buildings (WB) were 27.8 and 43.5 μg/m³, respectively. Mass concentrations of PM2.5 (24 h average) during February and March 2005 in Chiang Mai were higher than the US Environmental Protection Agency (USEPA), PM2.5, the 24 h standard of 65 μg/m³, and the annual PM2.5 of the outdoor and indoor of two sampling sites exceeded the annual standard of 15 μg/m³.

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