CHICAGO (WLS) — Most of the Chicago area remains under an Air Quality Alert on Saturday due to smoke from Canadian wildfires.

The alert was, at one point, set to expire late Friday night for most of the area, but it was extended through Sunday. The National Weather Service said the alert issued by the Illinois Environmental Protection Agency is set to expire at midnight Monday.

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AccuWeather Meteorologist Jaisol Martinez said haze from the smoke would still be visible on Saturday, but the air quality index in Chicago is slowly improving.

Conditions remained unhealthy for sensitive groups on Saturday, an improvement from being unhealthy for everyone, Martinez said.

Meanwhile, Lollapalooza continued on Saturday, drawing thousands of people outdoors.

The air conditions have not appeared to keep the large crowds from flocking to the annual music festival in Grant Park.

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Medical experts said the unhealthy air conditions are of most concern for active children and adults who have a respiratory condition. Those who experience a respiratory issue should go inside and seek medical attention if necessary.

Doctors said an N95 mask can help people outside, and people at home should make sure filters are fresh so that air conditioning is working at its best.

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