CHICAGO (WLS) — An air quality alert was issued for the greater Chicago area on Tuesday.

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The Illinois EPA issued an Air Pollution Action Day for Wednesday for the Chicago area.

The alert includes the counties of Cook, DuPage, McHenry, Lake (IL), Will, Kane, Kendall, and Grundy.

Lake, Porter, Newton and Jasper counties in Indiana are also under alert all day Tuesday.

The alert was also issued because of unhealthy ozone levels in addition to the smoke particles.

The Chicago area has been under air quality alerts for most of last week, due to smoke from Canadian wildfires.

At one point last week, Chicago had the worst air quality in the world.

At least 738 wildfires are currently burning in Canada, with at least 201 out of control, according to the Canadian Interagency Forest Fire Centre.

Health professionals have warned that poor air quality is particularly worrisome for active children and adults suffering from respiratory conditions. Individuals experiencing respiratory problems should go indoors and consider seeking medical help if needed.

Experts suggest that wearing an N95 mask can be beneficial for those outdoors, while ensuring that home air filters are clean can optimize the performance of air conditioning systems.

ABC News contributed to this report.

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