Abstract
The objectives of this study is to evaluate the effects of temperature and relative humidity on electrochemical and pothoionization sensors used to measure air pollutants (NO, NO2, SO2, CO, VOC), and to propose calibration methods to produce more reliable monitoring data. Measurement sensors for each substance were tested under four temperatures and three relative humidity conditions. The linearity measured for each condition of temperature and relative humidity was excellent, and the coefficient of determination of 0.92 to 0.99 was shown in all sensors. Under the condition that the concentration was zero, the baseline (intercept) of zero increased as the relative humidity of NO and some VOC sensors increased. As the temperature increased, the gas concentration increase rate (slope) in accordance with the variation of the SO2 and VOCM sensors increased, and the intercept of the CO sensor also tended to increase. In this study, slope and intercept were used to calibrate sensors for each air pollutant, and it is expected that the reliability of NO, NO2, SO2, CO, and VOC sensor data can be improved by deriving a relational expression based on this paper.
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