D.C. forecast: Worst air quality in years, with Code Red and Purple conditions - The Washington Post

What to know about the Air Quality Index from wildfire smoke and how it affects human health - ABC News

US air quality map shows cities plagued by Canadian wildfire smoke

Air quality: Canadian wildfire smoke blankets the U.S.

Washington D.C. air quality tracker: Smoke pollution improves in nation's capital

Air Quality Alert in Washington, DC Elevated to Code Purple” - PoPville

Twenty years ago, it was common to have dozens of “Code Red” bad air days per summer – Greater Greater Washington

The Fourth Of July Is Often DC's Worst Air Quality Day

Mayor Bowser Urges Residents to Follow Recommendations Related to the Code Red Air Quality Alert

When Will The Smoke Clear In VA, DC? 'Code Purple' In Friday Forecast

CODE PURPLE: DMV air quality worsens to 'very unhealthy' as haze lingers Thursday

Air quality in parts of DC has surpassed 300ppm and is officially classified as hazardous, maybe stay inside : r/washingtondc

At Code Purple, D.C. area air quality brings a wave of haze and closings - The Washington Post

At Code Purple, D.C. area air quality brings a wave of haze and closings - The Washington Post

COG on X: Health Advisory: Current air quality in the D.C. region is Code Purple, very unhealthy for all due to ongoing smoke from fires in Canada. Conditions may change today so

D.C. forecast: Worst air quality in years, with Code Red and Purple conditions - The Washington Post