Washington, DC, blanketed in a heavy haze from Canadian wildfires

Canada Candian DC District of Columbia Smithsonian castle US USA United States Washington air air quality blanket blanketed blanketing blankets cars center centered centering centers chemicals city downtown hazardous heavy mid-Atlantic monuments northeast particle particles pollution populations smog smoke toxic toxins traffic urban wildfires Canadian wildfires pollution Washington DC haze hazardous air quality Northeast Mid-Atlantic states