As the sun rose on Madison, Wis., Thursday morning, the air quality was measured at 242 — a "very unhealthy" purple alert rating — due to smoke from Canada's wildfires. Madison wasn't alone ...

Green (0–50) and yellow (51–100) indicate safe conditions, but orange, red, purple, and maroon signal escalating dangers, with maroon as an emergency state. Minnesota Air Quality ...

Green (0–50) and yellow (51–100) indicate safe conditions, but orange, red, purple, and maroon signal escalating dangers, with maroon as an emergency state. Read more news like this on ...