Influence of atmospheric fine particulate matter (PM_(2.5)) pollution on indoor environment during winter in Beijing

摘要

The objective of this study was to investigate the influence of atmospheric fine particulate matter (PM_(2.5)) pollution on indoor environment. Time series of indoor and outdoor PM_(2.5) mass concentrations in a naturally ventilated building were monitored continuously and simultaneously in winter in Beijing when haze-fog episodes happen frequently. Relationships between indoor and outdoor PM_(2.5) mass concentrations were examined and discussed. Indoor and outdoor PM_(2.5) mass concentrations showed close correlation (R~2 = 0.9104) when the windows are closed and there are no obvious indoor particle sources. The peak values of average indoor PM_(2.5) mass concentrations appeared at night, which were 1.5 times higher than the minimum values in daytime and showed an increasing trend from Monday to Friday in workdays. The indoor/outdoor PM_(2.5) mass concentrations ratios (I/O ratios) are closely correlated with outdoor wind speed and relative humidity. A prediction model was developed based on a method of mathematical statistics and it was applied to estimation of indoor PM_(2.5) mass concentrations by using outdoor PM_(2.5) mass concentrations and meteorological parameters as inputs. There is a good agreement between model results and the measured values with correlation coefficients of R~2 = 0.95. The findings can provide meaningful reference to further research on influence of atmospheric PM_(2.5) on indoor environment and help further develop approaches to control outdoor originated indoor PM_(2.5) in the haze-fog episodes.