Abstract

The objective of this study is to analyze the characteristic of indoor particles and the connection between indoor particles and outdoor particles. A long-term sampling and measurements of fine particulate matter (PM2.5) has been carried out around an resident area in Harbin (a typical urban in Chinese severe cold regions), which including indoor PM2.5 concentrations in two different types of residences, outdoor PM2.5 concentrations in the residential area, and PM2.5 concentrations near the regional heat source which supply heat for the residential area. This study analyses the affection of people's behavior on the indoor PM2.5 characteristic, the characteristic of PM2.5 in different seasons especially the uncommon characteristic during the heating season, and the influence of weather conditions (temperature, relative humidity, wind speed and solar radiation) on the characteristic of PM2.5. Besides, it shows the influence of outdoor atmospheric PM2.5 on the indoor environment is very strong based on the analysis of I/O ratios, outdoor PM2.5 is the main source of indoor PM2.5. If the outdoor haze intensifies, indoor PM2.5 concentrations will increase significantly.

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