The alert will reach the orange air quality level, indicating that sensitive groups should limit time outdoors.

AccuWeather meteorologist Paul Pastelok told USA TODAY that the wildfires are likely to continue well into October in Canada, so smoke will continue to be an issue in the United States into the fall.

Experts are trying to refine emergency alerts, as the GTA experienced some of the worst air quality in the world this week. Data released by the community platform Nextdoor Canada showed that roughly ...