Abstract
Low-cost particulate matter (PM) sensors may be suitable for indicative air quality measurements thanks to their small dimensions and high spatial resolution. Three different sensor types were selected for investigation in this study with specific focus on a Honeywell HPMA115S0 sensor to find out its usability at outdoors, perform load and long-term tests. The load test showed that the sensor calculates PM10 based on measured PM2.5 values. The analysis shows a break in calculation method at 25 μg/m3 PM2.5, and the calculation method for PM10 varies from 25 μg/m3 by around 81 μg/m3. Parallel test performed with different sensor types has shown that the protective cover formed by lamellar exterior does not affect the accuracy of the sensors, no accumulation or loss of sensitivity occurs. Long-term measurements have shown that the concentration values measured by the Honeywell sensor during outdoor measurements require humidity compensation, over 90% relative humidity (RH) the Pearson correlation coefficient (R) between the reference and sensor PM2.5 concentrations decreased by 0.3.
Highlights
particulate matter (PM) concentration is one of the most important indicator of ambient air quality due to its impact on human health [1], visibility [2] and climate [3, 4]
From a health point of view, the negative health effects of elevated PM concentrations include arrhythmia, heart disease, lung cancer and mortality [5]. Because of these serious consequences, the ambient concentrations of PM10 and PM2.5 are regulated by The United States Environmental Protection Agency (US EPA [6]), the European Union (Air Quality Directive 2008/50/EC, AQD [7]) and the Hungarian Legislation (306/2010 (XII 23.) Government Decree on Air Protection [8]), but the World Health Organization (WHO [9]) makes recommendations to that
The outliers were recorded during the measurements as none of the Honeywell sensors were under protective cover
Summary
PM concentration is one of the most important indicator of ambient air quality due to its impact on human health [1], visibility [2] and climate [3, 4]. From a health point of view, the negative health effects of elevated PM concentrations include arrhythmia, heart disease, lung cancer and mortality [5]. Because of these serious consequences, the ambient concentrations of PM10 and PM2.5 are regulated by The United States Environmental Protection Agency (US EPA [6]), the European Union (Air Quality Directive 2008/50/EC, AQD [7]) and the Hungarian Legislation (306/2010 (XII 23.) Government Decree on Air Protection [8]), but the World Health Organization (WHO [9]) makes recommendations to that. FEM-specific methods operate according to a measurement principle different from the gravimetric method of the FRM and EN12341:2014, such as optical detection [13], beta-ray absorption [14] or Tapered Element Oscillating Microbalance (TEOM) [15]), complying with strict requirements
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