Real-Time PM2.5 Monitoring in a Diesel Generator Workshop Using Low-Cost Sensors

Particulates from diesel generator operation are a known air pollutant with adverse health effects. In this study, we used low-cost particulate matter (PM) sensors to monitor PM2.5 in a diesel generator plant. We compared the measurement results from a PM sensor and a reference instrument (DustTrak), and we found a high correlation between them. The data overestimation or underestimation of PM sensors implied the need for data calibration. Hence, we proposed a data calibration algorithm based on a nonlinear support vector machines(SVM )model, and we investigated the effect of three calibration factors on the model: humidity, temperature, and total volatile organic compounds (TVOC). It was found that the TVOC correction coefficient has great influence on the model, which should be considered when calibrating the low-cost PM sensor in diesel generator operation sites. A monitoring network with six low-cost sensors was installed in the diesel generator plant to monitor PM2.5 concentration. It was found that normal diesel generator work, diesel generator set handling work, and human activity are the most dominant ways of producing particulate matter at the site, and dispersion is the main cause of increased PM2.5 concentrations in nonworking areas. In this study, PM2.5 emissions from two different diesel generators were tested, and PM2.5 concentrations at monitoring points reached 220 mu g/m(3) and 120 mu g/m(3), respectively. This further confirms that diesel generators produce many respirable particles when working.

Automated summary

Particulates from diesel generator operation are a known air pollutant with adverse health effects. In this study, low-cost particulate matter sensors were used to monitor PM2.5 in a diesel generator plant. A data calibration algorithm based on a nonlinear SVM model was proposed to improve the measurement accuracy of the sensors. It was found that diesel generator operation, handling work, and human activity were the main sources of particulate matter, and dispersion was the main cause of increased PM2.5 concentrations in nonworking areas.