Step outside and you'll probably smell it—smoke has been a major issue across much of Eastern Canada this weekend. Montreal and Toronto made the list for the top-five major global cities with the worst air quality on Sunday. The cities ranked fourth and fifth, respectively, with air quality values in the “unhealthy for sensitive groups” range.

Social media users are sharing information and updates regarding the wildfires. A user wrote, “Canada is burning and the AQI in Minnesota is atrocious and will continue to be for a while.”