The Correlation between Indoor and Outdoor Particulate Matter of Different Building Types in Daqing, China

At present, the prevalence of fog and haze seriously affect indoor air quality. More and more attention has been paid to indoor particulate pollution from the society. This paper studies the correlation and influence factors of indoor and outdoor particle concentration of cold area in the summer, which four kinds of building types(office, classroom, rural residential and urban residential) that a total of 110 households in Daqing were measured and analyzed by applying the particle on-line monitors. The results shows that the overall air quality in Daqing is better in summer. There is a linear relationship between the indoor and outdoor particles concentration, and the infiltration factor is applied to represent the degree of correlation. For office and residential buildings, the infiltration factor is 0.7214 and 0.7499. As for the classroom and rural housing, the infiltration factor is 0.9217 and 0.9019 due to the higher air exchange rate. In summer, there are about 80% of the indoor particles coming from outside with natural ventilation buildings. Moreover, there is a significant positive correlation among indoor particles concentration and outdoor particles concentration, temperature and humidity (p<0.05), but different building types have obvious difference. Temperature and humidity as an important factor affecting the concentration of indoor particulate matter, the influence of indoor and outdoor temperature is greater for offices (O1) and classrooms with the glass exterior wall, and the relative humidity is the main factor for the rest of the building with concrete wall structure.