epa12169917 A haze of smoke from Canadian wildfires blankets the sky and mountains at the Urnersee in Brunnen, Switzerland, 11 June 2025. The smoke, originating from wildfires in the Canadian Manitoba and Saskatchewan provinces, crossed the Atlantic, according to the Copernicus Atmosphere Monitoring Service (CAMS). EPA/URS FLUEELER

epa12169916 A haze of smoke from Canadian wildfires blankets the sky and mountains at the Urnersee in Brunnen, Switzerland, 11 June 2025. The smoke, originating from wildfires in the Canadian Manitoba and Saskatchewan provinces, crossed the Atlantic, according to the Copernicus Atmosphere Monitoring Service (CAMS). EPA/URS FLUEELER