Background: The epidemiological evidence on the interaction between heat and ambient air pollution on mortality is still inconsistent. Objectives: To investigate the interaction between heat and ambient air pollution on daily mortality in a large dataset of 620 cities from 36 countries. Methods: We used daily data on all-cause mortality, air temperature, particulate matter ≤ 10 μm (PM10), PM ≤ 2.5 μm (PM2.5), n...
Highlights: - Heat effect modification by air pollution on cardiovascular and respiratory mortality was investigated across 482 cities.- Heat effect was seen to be significantly modified by air pollutants PM10, PM2.5, O3, and NO2. -This study is the most extensive research to date investigating the heat effect modification on cardiovascular and respiratory mortality. - This is the first-ever study to deeply inv...