High ozone levels, combined with smoke from Canadian wildfires, led to air quality alerts and hazy cries across Chicago on Monday.
Over 160 wildfires are burning in Quebec, according to the provincial fire protection authority. Many are out of control amid an exceptionally active fire season. Another wildfire burning near Grayling, Michigan is also contributing some smoke.
Lee Carlaw, a meteorologist with the National Weather Service office in Romeoville, said that much of the smoke that’s blown into the area is high in the atmosphere, creating milky hazy conditions across the Chicago region. But Monday’s poor air quality at ground level is related more to elevated ozone levels. Ground-level ozone is created when nitrogen oxide and volatile organic compounds interact with sunlight.
Feeling out of the loop? We'll catch you up on the Chicago news you need to know. Sign up for the weekly“There were already antecedent high levels of particulates in the atmosphere that have sort of just been recycled with the kind of light winds that we’ve had over the last several days,” Carlaw said. “There is certainly some impact from the smoke, but it’s certainly not a primary one.” Thursday warning of high ozone levels starting Friday.
Active people and those with respiratory or pulmonary disorders, such as asthma, are particularly at risk, the state warned last week. Low air quality could lead to shortness of breath or coughing, and everyone should limit outdoor activity.
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