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- W4283655356 abstract "<p>Routine ambient air quality monitoring is mandated by U.S. federal law, but many regions of the U.S. are sparsely monitored due in part to the high cost of regulatory monitors.&#160; Low-cost sensors can fill data gaps when it is neither feasible nor cost-effective to expand regulatory monitoring networks.&#160; Initial comparisons of ambient measurements from the PurpleAir PA-II sensor &#8211; a low-cost (<$300 USD) and commercially available sensor that measures fine particulate matter (PM<sub>2.5</sub>) using a laser particle counter &#8211; with nearby (~2 km) regulatory PM<sub>2.5</sub> monitors maintained by the Asheville Buncombe Air Quality Agency in Asheville, North Carolina, indicate general agreement.&#160; Continuous data collection began in January 2022, thus capturing a range of atmospheric conditions and seasonal changes in PM<sub>2.5</sub> concentrations.&#160; High water vapor content is known to affect the performance of optical particle counters such as the PA-II, so additional summertime measurements may reveal persistent biases in air quality measurements in these conditions.</p><p>The PA-II sensor also measures temperature, relative humidity, and barometric pressure.&#160; Preliminary analyses compare the sensor&#8217;s measurements of these environmental variables to co-located research-grade meteorological instrumentation, including Campbell Scientific, Inc. 107 and 109 temperature probes, a Vaisala HMP45C temperature and relative humidity probe, and a Vaisala PTB101B barometer. Results reveal an expected high temperature bias of several degrees Fahrenheit caused by the small amount of heat generated by the electronics contained in the PA-II&#8217;s housing. A low relative humidity bias is a consequence of the temperature performance. Barometric pressure measurements from the PA-II sensor are consistently high by about 2-3 hPa.</p>" @default.
- W4283655356 created "2022-06-29" @default.
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- W4283655356 date "2022-06-28" @default.
- W4283655356 modified "2023-10-16" @default.
- W4283655356 title "A comparison of the PurpleAir PA-II sensor to both regulatory particulate matter monitors and meteorological instrumentation in Asheville, North Carolina" @default.
- W4283655356 doi "https://doi.org/10.5194/ems2022-289" @default.
- W4283655356 hasPublicationYear "2022" @default.
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