Tropospheric NO 2 patterns in eastern Canada using the first year of TEMPO observations

Siu, Tsz Kin, Goldberg, Daniel L., Kerr, Gaige H., Chen, Lulu, Nawaz, M. Omar, Chang, Rachel Y.‐W. and Fong, Kelvin C. 2025. Tropospheric NO 2 patterns in eastern Canada using the first year of TEMPO observations. Journal of Geophysical Research: Atmospheres 130 (24) , e2025JD044757. 10.1029/2025jd044757

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Abstract

Plain Language Summary: Nitrogen dioxide (NO2) is an air pollutant primarily associated with anthropogenic emissions and poses a significant health burden. A new satellite instrument, Tropospheric Emissions: Monitoring of Pollution (TEMPO), monitors NO2 pollution in eastern Canada covering more hours during daytime. Using TEMPO's first‐year observations from September 2023 to August 2024, this study explores NO2 spatiotemporal patterns in Ontario, Quebec, and the Atlantic provinces. High NO2 concentrated in large metropolitan areas (e.g., Toronto, Montreal), industrial cities (e.g., Windsor, Sarnia, Saint John), and port communities (e.g., Halifax, Quebec City). TEMPO identified additional municipalities with high NO2 pollution previously unobserved in suburban and remote areas. We observed annual, seasonal, weekday‐weekend, and diurnal NO2 characteristics, which might be attributed to local traffic, industry, and wind‐driven transport. These patterns can provide implications for air pollution control. Our findings also motivate future research on applying TEMPO for studying NO2 exposure and its impacts in eastern Canada.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Schools > Earth and Environmental Sciences
Additional Information:	License information from Publisher: LICENSE 1: URL: http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher:	American Geophysical Union
ISSN:	2169-897X
Date of First Compliant Deposit:	22 December 2025
Date of Acceptance:	28 November 2025
Last Modified:	22 Dec 2025 11:30
URI:	https://orca.cardiff.ac.uk/id/eprint/183409

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