Abstract
<strong class="journal-contentHeaderColor">Abstract.</strong> 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 NO<sub>2</sub> and O<sub>3 </sub>+ NO<sub>2</sub>) 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 (O<sub>3</sub>), nitrogen dioxide (NO<sub>2</sub>), and odd oxygen (O<sub>X</sub> = O<sub>3</sub> + NO<sub>2</sub>) on an ongoing basis through comparisons with fixed regulatory sites.
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