Air quality alerts were issued across the Northeast and Midwest US on August 5 due to elevated PM2.5 levels from Canadian wildfire smoke. Affected states include New Jersey, New York, Connecticut, Pennsylvania,

Wildfires in Canada are leaving a trail of smoke across the northern United States and prompting local authorities to issue health warnings for millions of people because of poor air quality.

Smoke from Canadian wildfires hovered over several Midwestern states Saturday, bringing warnings of unhealthy air for at least the third day.