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The objective of this study was to investigate PM10 and CO2 concentrations in the classrooms of 286 elementary schools in Suwon, Ansan, and Hwaseong in the province of Gyeonggi between August 2008 and December 2012. By gaining an understanding of the environmental factors that influence these concentrations, this study also aimed to establish a management plan for indoor air quality in schools, which substantially affects the health of elementary students. When the schools were classified by region, no statistically significant difference in PM10 concentration was observed. However, PM10 concentration was relatively high in industrial areas and low in rural areas. No difference in CO2 concentration was observed among the surveyed cities. Analysis of annual PM10 concentration showed that the highest values for Suwon and Hwaseong occurred in 2008 and 2009, respectively (p<0.01). In the case of Ansan, the highest concentration occurred during 2009, but the difference was not significant compared to the other years. Analysis of the annual CO2 concentration of each city shows no significant difference among the cities (p-value=0.366,0.730,0.210). According to a time series analysis of PM10 and CO2 by season, from autumn 2008 to winter 2012, PM10 concentration was high during 2009, then it gradually decreased until 2012, and started to increase again. While no difference in annual CO2 concentration was observed, the concentration had a tendency to be higher in spring and winter than in summer. By analyzing the relationship between PM10 and CO2 and the environmental factors (years of construction, average students of classroom, temperature, and humidity), it showed a significant negative correlation was found between CO2 and the environmental temperature and humidity, at -0.329 and -0.188, respectively (p<0.01).

A Study on the PM<sub>10</sub> and CO<sub>2</sub> Concentrations at Public Places