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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-396
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-396
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 05 Nov 2019

Submitted as: research article | 05 Nov 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Measurements of PM2.5 with PurpleAir under atmospheric conditions

Karin Ardon-Dryer1, Yuval Dryer1, Jake N. Williams1, and Nastaran Moghimi2 Karin Ardon-Dryer et al.
  • 1Department of Geosciences, Atmospheric Science Group, Texas Tech University, TX
  • 2Thomas S. Wootton High School, North Potomac, MD

Abstract. The PurpleAir PA-II unit is a low-cost sensor for monitoring changes in the concentrations of Particulate Matter (PM) of various sizes. There are currently more than 9000 PA-II units worldwide; some of them are located in areas where no other reference air monitoring system is present. Previous studies have examined the performance of these PA-II units (or the sensor within them) in comparison to a co-located reference air monitoring system. However, because PA-II units are installed by PurpleAir customers, the PA-II units are not co-located with a reference air monitoring system and, in many cases, are not near one. This study aimed to examine how PA-II units perform under atmospheric conditions when exposed to a variety of pollutants and PM2.5 concentrations. We were interested in knowing how accurate these PA-II units are when measuring PM2.5 concentrations with their sensitivity to concentration changes in comparison to the Environmental Protection Agency (EPA) Air Quality Monitoring Stations (AQMS) that are not co-located with them. For this study, we selected eight different locations, where each location contains multiple PA-II units (minimum of seven per location, a total of 86 units) and at least one AQMS (total of 14). PM2.5 measurements from each PA-II unit were compared to those from the AQMS and other PA-II units in its area. The comparisons were made based on hourly and daily PM2.5 measurements. In most cases, the AQMS and PA-II units were found to be in good agreement; they measured similar values and followed similar trends, that is, when the PM2.5 values measured by the AQMS increased or decreased, so did those of the PA-II. In some high-pollution events, the PA-II measured higher PM2.5 values compared to those measured by the AQMS. We found PA-II PM2.5 measurements to remain unaffected by changes in temperature or Relative Humidity (RH). Overall, the PA-II unit seems to be a promising tool for identifying relative changes in PM2.5 concentration with the potential to complement sparsely distributed monitoring stations and to aid in assessing and minimizing the public exposure to PM, particularly in areas lacking the presence of an AQMS.

Karin Ardon-Dryer et al.
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Short summary
The PurpleAir PA-II is a low-cost sensor for monitoring changes in the concentrations of Particulate Matter of various sizes. This study examined the behavior of multiple PA-II units, in eight locations in the USA, under atmospheric conditions when exposed to a variety of pollutants and different PM2.5 concentrations. We found that even though some PA-II units overestimated or underestimated most were in agreement and measured similar PM2.5 concentrations compared to reference PM2.5 sensors.
The PurpleAir PA-II is a low-cost sensor for monitoring changes in the concentrations of...
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