The previous record, set in 2021, was five days. The current alert is expected to last seven days. It will remain in effect through Monday, Aug. 4, at noon.

The MPCA says that sensitive groups should avoid prolonged or heavy exertion, and everyone should limit their time spent outdoors.

As the air quality in Minnesota remains dangerous, experts are giving advice. "It's not a one-size-fits-all answer," said Dr. Andrew Stiehm, who's a pulmonologist for Allina Health. "I just reinforce stay inside, pay attention to the air quality index."