The 2023 Canadian wildfires impacted not only the local air quality but also that of most areas in the northern hemisphere, causing severe PM2.5 pollution in the northeastern United States and increasing daily mean PM2.5 concentration in China.

The 2023 Canadian wildfires impacted not only the local air quality but also that of most areas in the northern hemisphere, causing severe PM2.5 pollution in the northeastern United States and increasing daily mean PM2.5 concentration in China.