Research on outdoor environmental performance evaluation of low-cost atmospheric particulate sensors
GUO Ying-zhe1,2, GAO Jian2, WANG Wen-xing1,2, QIN Xiao-liang2, REN Jian-ning2, NI Deng-feng2,3
1. Environmental Research Institute, Shandong University, Qingdao 266237, China; 2. Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 3. College of Environment and Resources, Shanxi University, Taiyuan 030006, China
Abstract：In this paper, three types of sensors based on the light scattering method used in atmospheric environmental particulate matter monitoring are evaluated and researched, of which A and B are used for indoor environmental monitoring, and C is used for outdoor environmental monitoring. The three types of particulate matter sensors are compared with the standard instrument MATONE BAM-1020based on the β-ray method, and the variability of the sensor, the time series, the linear correlation between the sensor and the standard instrument, the influence of other factors, and the data quality are analyzed. The results show that there is a strong correlation between the various types of particulate matter sensors (R2 has reached 0.95 or more); the measurement results of the three particulate matter sensors and the standard instrument have a high degree of agreement, and R2 is 0.58, 0.80, 0.61, respectively, and during the entire test period, the sensor overestimated PM2.5 relative to the standard instrument; high relative humidity (RH>50%) and PM2.5/PM10 (ratio) will affect the sensor. The average absolute error (MAE) of the PM2.5 data of the three types of sensors of A, B, and C are 23.31, 10.14, 28.17μg/m3 respectively; the normalized root mean square error (RMSE) is 25.80, 14.01, 32.98μg/m3; the accuracy (A%) is 51.39%, 72.97%, 46.51%, respectively.
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