CHICAGO - Chicago's air quality reached an unhealthy level on Thursday, prompting the National Weather Service to issue an alert.

What we know:

The alert is in effect all day.

The unhealthy conditions are caused by tiny particles in the air from wildfire smoke drifting into the region, according to the Illinois Environmental Protection Agency.

The air quality is in the "Unhealthy" category, which means everyone can be affected, but especially people with heart or lung conditions, older adults, children and teens.

What you can do:

If you are at higher risk, it is recommended to avoid strenuous activities outdoors and try to do exercise or physical activity indoors. If you have to be outside, keep your time short.

For everyone else, it's advised to just take it easy outside, such as

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