High ozone levels, combined with smoke from Canadian wildfires, led to air quality alerts and hazy skies 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.
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. RELATED: Michigan wildfire burns through 3.6K acres, forcing evacuations and closure of nearby highway 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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