Iowans — especially those with heart and lung disease — should avoid long or intense activities and take extra breaks during strenuous activity outdoors in areas where air quality is rated unhealthy.

To check your state's air quality, visit AirNow's website, and plug in your zip code, city or state. Here's what to know as of Wednesday, June 4. Parts of Wisconsin, Iowa, Illinois, Indiana and Michigan have air quality that is considered unhealthy for sensitive groups or unhealthy for all, according to AirNow.