Impact of Reduced Anthropogenic Emissions Associated With COVID-19 Lockdown on PM_2.5 Concentration and Canopy Urban Heat Island in Canada.

ABSTRACT: Extensive lockdowns during the COVID-19 pandemic caused a remarkable decline in human activities that have influenced urban climate, especially air quality and urban heat islands. However, the impact of such changes on local climate based on long term ground-level observations has hitherto not been investigated. Using air pollution measurements for the four major Canadian metropolitan areas (Toronto, Montreal, Vancouver, and Calgary), we find that PM_2.5 markedly decreased during and after lockdowns with peak reduction ranging between 42% and 53% relative to the 2000-2019 reference period. Moreover, we show a substantial decline in canopy urban heat island intensity during lockdown and in the post lockdowns periods with peak reduction ranging between 0.7°C and 1.6°C in comparison

SUBMITTER: Ashraf S 

PROVIDER: S-EPMC11786188 | biostudies-literature | 2025 Feb

REPOSITORIES: biostudies-literature