DETROIT (FOX 2) - An Air Quality Alert is in effect once again today with one major difference. Yesterday's poor air quality was due to smoke from the Canadian wildfires. Today, that's more prevalent to our north, near Saginaw and Flint. Our Air Quality Alert is due to the formation of ground-level ozone.

Air quality is determined by the number of pollutants in the sky; the main culprit in Detroit is the PM2.5 pollutant, a fine particulate matter that causes the sky to look hazy and reduces visibility.

According to the IQAir Air Quality Index, as of 1:45 p.m., Detroit ranked as the worst city in the world for air quality. Other U.S. cities ranked among the top 10 worst cities, ...

As of Tuesday morning, Chicago, Minneapolis and Detroit have the worst air quality conditions among American cities, according to IQ Air's live ranking of major world cities, which ranks them 8th ...

According to Dr. Meilan Han, the chief of pulmonary and critical care at the University of Michigan, poor air quality also weakens your immune system, making you more susceptible to respiratory ...

An Air Quality Alert will be in effect through midnight Tuesday for Southeast Michigan, the state's Department of Environment, Great Lakes and Energy announced Monday. The alert is an extension of an existing alert that was issued statewide Saturday and expected to expire Monday night because of drifting wildfire smoke from Canada.

Air Quality alert is extended through Tuesday. As the wildfire smoke thins tomorrow, ozone at the surface will increase keeping the air quality a concern. High temperatures Tue. near 90° in spots.

DETROIT – Air quality in the Metro Detroit area was even worse on Wednesday than it was on Tuesday, ranking as second-worst in the world, as of Wednesday morning.

Between 2017 and 2019, 16.2% of Detroit adults and 14.6% of Detroit children had asthma, compared with 11.1% of Michigan adults and 8.4% of Michigan children.