. Author manuscript; available in PMC: 2022 Mar 16.

Published in final edited form as: Environ Sci Technol. 2021 Feb 26;55(6):3530–3538. doi: 10.1021/acs.est.0c04328

Table 2.

Summary of monitoring data at mobile and PSD site by pollutant and region

Pollutant	Site type	Winter/Spring		Summer
Pollutant	Site type	n	Mean ± SD	n	Mean ± SD
NO₂ (ppb)	Los Angeles, CA
	Mobile	-	-	43	12.3±3.22
	PSD	-	-	43	14.9±3.37
NO_x (ppb)	Los Angeles, CA
	Mobile	43	37.7±7.56	43	25.4±3.32
	PSD	43	48.6±6.93	43	25.1±4.58
	Baltimore, MD
	Mobile	42	35.2±10.0	42	24.5±6.30
	PSD	42	40.2±11.2	42	12.2±5.67