Meteorologists are advising Chicago residents to limit outdoor activities after parts of the city's Air Quality Index (AQI) reached as high as 753 on Thursday afternoon, a level considered 'extremely hazardous'.
'Everyone should reduce prolonged activities or heavy exertion outdoors. Active children, older adults, and people with pulmonary or respiratory disease such as asthma should avoid prolonged activities or heavy exertion outdoors,' the National Weather Service advised.
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