Abstract
The concentrations in the underground should be monitored for the health of commuters on the underground subway system. Seoul Metro and Seoul Metropolitan Rapid Transit Corporation are measuring several air pollutants regularly. As for the measurement of concentrations, instruments based on -ray absorption method and gravimetric methods are being used. But the instruments using gravimetric method give us 20-hour-average data and the -ray instruments can measure the concentration every one hour. In order to keep the concentrations under a healthy condition, the air quality of the underground platform and tunnels should be monitored and controlled continuously. The instruments using light scattering method can measure the concentrations every less than one minute. However, the reliability of the instruments using light scattering method is still not proved. The purpose of this work is to study the reliability of the instruments using light scattering method to measure the concentrations continuously in the underground platforms. One instrument using -ray absorption method and two different instruments using light scattering method (LSM1, LSM2) were placed at the platform of the Jegi station of Seoul metro line Number 1 for 10 days. The correlation between the -ray instrument and the LSM2 (
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