"Wildfire Smoke Blankets U.S. Cities, Prompting Air Quality Concerns"

Washington, D.C. has issued a Code Red alert for air quality due to smoke from wildfires in Canada, which has caused worsening conditions in the city. The poor air quality may be particularly harmful to individuals with heart or lung disease, older adults, children, and teens. Other cities in the U.S., including Pittsburgh, Detroit, Cincinnati, Chicago, Philadelphia, and Baltimore, are also experiencing some of the worst air quality. Residents are advised to wear masks, reschedule outdoor activities, and opt for less strenuous exercises.