Preprints
https://doi.org/10.5194/amt-2021-425
https://doi.org/10.5194/amt-2021-425
 
18 Jan 2022
18 Jan 2022
Status: a revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Development and Evaluation of Correction Models for a Low-Cost Fine Particulate Matter Monitor

Brayden Nilson1,2, Peter L. Jackson1, Corinne L. Schiller1,2, and Matthew T. Parsons2 Brayden Nilson et al.
  • 1Department of Geography, Earth and Environmental Sciences, University of Northern British Columbia, Prince George, V2N 4Z9, Canada
  • 2Air Quality Science – West, Meteorological Service of Canada, Environment and Climate Change Canada, Vancouver, V6C 3S5, Canada

Abstract. Four correction models with differing forms were developed on a training data set of 32 PurpleAir-Federal Equivalent Method (FEM) hourly fine particulate matter (PM2.5) observation colocation sites across North America (NA). These were evaluated in comparison with four existing models from external sources using the data from 15 additional NA colocation sites. Colocation sites were determined automatically based on proximity and a novel quality control process. The Canadian AQHI+ system was used to make comparisons across the range of concentrations common to NA, as well as to provide operational and health-related context to the evaluations. The model found to perform the best was our Model 2, PM2.5-corrected = PM2.5-cf-1 / (1 + 0.24 / (100 / RH% − 1)) – RH is limited to the range [30 %, 70 %], which is based on the RH growth model developed by Crilley et al. (2018). Corrected concentrations from this model in the moderate to high range, the range most impactful to human health, outperformed all other models in most comparisons. Model 7 (Barkjohn et al., 2020) was a close runner up and excelled in the low concentration range (most common to NA). The correction models do not perform the same at different locations, so we recommend testing several models at nearby colocation sites and utilizing that which performs best if possible. If no nearby colocation site is available, then we recommend using our Model 2. This study provides a robust framework for the evaluation of low-cost PM2.5 sensor correction models and presents an optimized correction model for North American PA sensors. 

Brayden Nilson et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on AMT-2021-425', Anonymous Referee #1, 08 Feb 2022
    • AC1: 'Reply on RC1', Brayden Nilson, 24 Mar 2022
  • RC2: 'Comment on amt-2021-425', Anonymous Referee #2, 08 Feb 2022
    • AC2: 'Reply on RC2', Brayden Nilson, 24 Mar 2022
  • RC3: 'Comment on amt-2021-425', Anonymous Referee #3, 22 Feb 2022
    • AC3: 'Reply on RC3', Brayden Nilson, 24 Mar 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on AMT-2021-425', Anonymous Referee #1, 08 Feb 2022
    • AC1: 'Reply on RC1', Brayden Nilson, 24 Mar 2022
  • RC2: 'Comment on amt-2021-425', Anonymous Referee #2, 08 Feb 2022
    • AC2: 'Reply on RC2', Brayden Nilson, 24 Mar 2022
  • RC3: 'Comment on amt-2021-425', Anonymous Referee #3, 22 Feb 2022
    • AC3: 'Reply on RC3', Brayden Nilson, 24 Mar 2022

Brayden Nilson et al.

Brayden Nilson et al.

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Short summary
Correction models were developed using PurpleAir-Federal Equivalent Method (FEM) hourly fine particulate matter (PM2.5) observation colocation sites across North America (NA). These were evaluated in comparison with four existing models at an additional 15 NA colocation sites. This study provides a robust framework for the evaluation of low-cost PM2.5 sensor correction models using the Canadian AQHI+ system and presents an optimized correction model for North American PA sensors.