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The purpose of this study was to investigate the concentration and distribution characteristics of PM 10 at high schools classrooms in Ulsan and its surroundings. This study evaluated PM 10 levels in classrooms at 79 high schools in Ulsan from May 2008 to May 2009. The average PM 10 level was 63.8 ㎍/㎥, and the rate of exceeding the statutory maintenance limit was 16.0%. The average PM 10 level was higher in general schools (64.9 ㎍/㎥) compared to professional schools (59.2 ㎍/㎥), and private schools (66.6 ㎍/㎥) was higher than that of public schools (62.5 ㎍/㎥). The average PM 10 level (68.4 ㎍/㎥) in general classrooms was significantly (p  0.01) higher than that in multi-purpose ones (54.6 ㎍/㎥), and first-year student classrooms (73.3 ㎍/㎥) was significantly (p  0.05) higher than that in second or third grade ones (67.6 ㎍/㎥, 51.5 ㎍/㎥, respectively). The PM 10 level in schools in Dong-Gu in the vicinity of assorted industrial complexes was higher than that of schools located in other districts around the Ulsan Metropolitan Area. The regression model showed that PM 10 level was positively associated with number of students and relative humidity.

Concentration and Distribution Characteristics of PM10in High Schools in the Ulsan Metropolitan Area

Concentration and Distribution Characteristics of PM₁₀in High Schools in the Ulsan Metropolitan Area