Chemical composition of outdoor and indoor PM2.5 collected during haze events: Transformations and modified source contributions resulting from outdoor-to-indoor transport

Indoor Air
Yangyang Xie, Bin Zhao

Abstract

Changes in the chemical constitution and sources of ambient PM2.5 following the infiltration of air into indoor environments were investigated. We collected PM2.5 samples from air inside and outside 31 rooms in Beijing residences during hazy episodes. We calculated the indoor-to-outdoor ratios and the correction (ki ) of each infiltration factor for each chemical component of PM2.5 to determine the effects of infiltrative behavior. The outdoor and indoor mass concentrations of PM2.5 during the sampling period were 70-460 and 10-315 μg/m3 , respectively. Differences in the average indoor-to-outdoor ratios of PM2.5 mass and each component (mean value ± standard deviation: PM2.5 mass = 0.53 ± 0.26, organic matter = 0.75 ± 0.34, elemental carbon = 0.62 ± 0.31, trace elements = 0.62 ± 0.26, <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow><mml:msubsup><mml:mtext>SO</mml:mtext> <mml:mrow><mml:mn>4</mml:mn></mml:mrow> <mml:mrow><mml:mn>2</mml:mn> <mml:mo>-</mml:mo></mml:mrow> </mml:msubsup> <mml:mo>=</mml:mo> <mml:mn>0.67</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.32</mml:mn></mml:mrow> </mml:math> , <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow><mml:msubsup><mml:mtext>NH</mml:mtext> <mml:mrow><mml:...Continue Reading

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Citations

Dec 26, 2018·Ecotoxicology and Environmental Safety·Murnira OthmanYutaka Matsumi

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