02 May 2023
 | 02 May 2023
Status: a revised version of this preprint is currently under review for the journal AMT.

Mobile Air Quality Monitoring and Comparison to Fixed Monitoring Sites for Quality Assurance

Andrew R. Whitehill, Melissa Lunden, Brian LaFranchi, Surender Kaushik, and Paul A. Solomon

Abstract. Air pollution monitoring using mobile ground-based measurement platforms can provide high quality spatiotemporal air pollution information. As mobile air quality monitoring campaigns extend to entire fleets of vehicles and embrace lower cost air quality sensors, it is important to address the quality assurance needs for validating these measurements. We explore collocation-based evaluation of air quality instruments in a mobile platform against fixed regulatory sites, both when the mobile platform is parked at the fixed regulatory site and when moving at distances of meters to kilometers from the site. We demonstrate agreement within 4 ppbv (for NO2 and O3 + NO2) to 10 ppbv (for NO) when using a running median of 40 hourly differences between the moving mobile platform measurements and stationary site measurements. The comparability is strong when only measurements from residential roads are used but are only slightly diminished when all roads except highways are included in the analysis. We present a method for assessing mobile measurements of ozone (O3), nitrogen dioxide (NO2), and odd oxygen (OX = O3 + NO2) on an ongoing basis through comparisons with fixed regulatory sites.

Andrew R. Whitehill et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on amt-2023-82', Anonymous Referee #1, 25 May 2023
    • AC1: 'Reply on RC1', Andrew Whitehill, 30 Nov 2023
  • RC2: 'Comment on amt-2023-82', Anonymous Referee #2, 26 May 2023
    • AC1: 'Reply on RC1', Andrew Whitehill, 30 Nov 2023
  • RC3: 'Comment on amt-2023-82', Anonymous Referee #3, 31 May 2023
    • AC1: 'Reply on RC1', Andrew Whitehill, 30 Nov 2023

Andrew R. Whitehill et al.

Andrew R. Whitehill et al.


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Short summary
We present an analysis from two large-scale mobile air quality monitoring campaigns in Colorado and California. We compare mobile measurements of air quality to measurements from nearby regulatory sites. The goal of this paper is to explore how fixed-site measurements (such as regulatory site measurements) can be used for ongoing calibration of mobile monitoring platforms over extended measurement campaigns.