Abstract
Meteorological parameters such as relative humidity have a significant impact on the precision of PM2.5 measurement instruments based on light scattering. Instead of adding meteorological sensors or dehumidification devices used widely in commercial PM2.5 measurement instruments, a novel particle sensor based on multi-angle light scattering and data fusion is proposed to eliminate the effect of meteorological factors. Three photodiodes are employed to collect the scattered light flux at three distinct angles. Weather index is defined as the ratio of scattered light fluxes collected at the 40° and 55° angles, which can be used to distinguish the mass median diameter variation caused by different meteorological parameters. Simulations based on Lorenz-Mie theory and field experiments establish the feasibility of this scheme. Experimental results indicate that mass median diameter has less effect on the photodiode at the 55° angle in comparison with photodiodes at the 40° angle and 140° angle. After correction using the weather index, the photodiode at the 40° angle yielded the best results followed by photodiodes at the 55° angle and the 140° angle.
Highlights
Fine particles with aerodynamic diameters of 2.5 μm or less (PM2.5) have received considerable attention because of their adverse impacts on human health, especially their ability to penetrate deep into our lungs and even blood streams
PM2.5 has been listed in the revised Chinese National Ambient Air Quality Standards (NAAQS)
Monitoring networks have been established to record the levels of fine particulate matter (PM2.5) in China
Summary
Fine particles with aerodynamic diameters of 2.5 μm or less (PM2.5) have received considerable attention because of their adverse impacts on human health, especially their ability to penetrate deep into our lungs and even blood streams. In 2013, the International Agency for Research on Cancer (IARC). Classified Particulate Matter (PM) from outdoor air pollution as carcinogenic to humans [1]. PM2.5 has been listed in the revised Chinese National Ambient Air Quality Standards (NAAQS). The limit of daily average PM2.5 mass concentration is 35 μg/m3 while it is 10 μg/m3 inthe World Health. Monitoring networks have been established to record the levels of fine particulate matter (PM2.5) in China. There are several technologies that can be used to determine the PM2.5 mass concentrations, among which the Tapered Element Oscillating
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