"Wildfire Smoke Continues to Impact US Cities, Extending Air Quality Alert"

Smoke from Canadian wildfires continues to affect air quality in several US cities, including New York, Chicago, Detroit, and Washington, D.C. However, forecasts indicate that the smoke will start to ease by Friday afternoon and through the weekend. Most of the US is expected to have moderate air quality, except for Detroit and Cleveland, which may remain in the unhealthy category for sensitive groups. The ongoing Canadian wildfires are likely to cause smoky air throughout the summer, with no signs of ending soon. The Air Quality Index (AQI) measures pollution levels, ranging from good to hazardous, with different color-coded categories indicating the level of risk.