서울 일부 지하철 승무원석의 PM, 이산화탄소, 일산화탄소 모니터링에 의한 실내 공기질 특성 평가

Evaluation on Air Quality inside Subway Driver Cabin byMonitoring PM, CO2, and CO Levels

PM10, PM2.5, CO2 and CO in driver cabins of subway line from 5 to 8 were monitored from 07:00 through 21:00 (or19:30 or 20:00) on May. Driver cabin of subway line 7 showed the highest PM10, PM2.5, CO2 and CO concentrations.General Linear Model indicated that subway line, subway location (ground and underground track) and running time(morning and afternoon) significantly influenced the concentrations of PM10, PM2.5, CO2 and CO (p=0.000). Daily profileof PM10, PM2.5, CO2 and CO, expressed as an 30 minutes average, showed similar variation pattern over day period.These concentrations showed the highest concentrations between 07:00 and 09:00 of rush hour, slightly dropped andagain rose slightly after 18:00. In correlation analysis, significant relations among PM10, PM2.5, CO2, and CO weredetected (p<0.01). In particular, correlation coefficient between PM10 and PM2.5 was highly significant (r=0.884).Regression analysis also concluded that PM10 concentration significantly explained 71.4% of variation of PM2.5 concentration(p=0.000, R2=0.714). Correlations by CO with PM10 and PM2.5 were 0.451 and 0.520, which were higher thanthose by CO2. Further study is needed to examine the sources of PM2.5 and CO in subway and to compare pollutantsconcentration among subway lines.