Canadian Wildfire Smoke Triggers Air Quality Alerts Across U.S.

Air quality alerts continue in the US due to smoke from Canadian wildfires, with health officials warning people to limit their time outdoors. The Federal Aviation Administration issued a ground stop on flights bound for New York City's LaGuardia Airport due to poor visibility. The Air Quality Index spiked to "hazardous" levels in Philadelphia, and employees at the National Mall in Washington, D.C., were encouraged to scale back all outdoor activities. President Biden urged people in affected areas to monitor the Air Quality Index and "check on one another." The smoke is expected to reach Europe, but scientists do not believe it will be harmful to health.