The highest AQ index in Michigan (as of 15:00 EDT) is currently the Southwest area. Ozone (OZONE) is measuring at 90 (Moderate). This means air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Over the next few days, the highest Particle Pollution (PM2.5) will be in the Bay Area-Thumb Area area. It is forecasted to be Moderate, meaning air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
High pressure will remain in control across central and southern areas through Wednesday. A weak boundary will drift into northern sections today (Tuesday), bringing precipitation chances there, while southern areas experience sunshine, warm temperatures, and comfortable humidity. On Wednesday, the boundary will sag southward, introducing precipitation chances from Wednesday into Thursday. After the front passes, high pressure will build in from the north, ending precipitation from north to south. Some showers may linger in southern areas, but most locations will see dry conditions and seasonably comfortable temperatures. A clean background and persistent northeasterly flow on Tuesday will help limit both ozone and PM2.5 formation. PM2.5 daily averages are expected to remain within the Good to low‑Moderate range through Wednesday. For ozone, 8‑hour concentrations are anticipated to fall within the Good to Moderate range Tuesday. By Wednesday, winds shift to the south, and the combination of warmer temperatures, abundant sunshine, and favorable transport patterns will support ozone formation across western and southwestern Michigan, especially near the lakeshore. Because of this threat, we have issued an Air Quality Alert for those forecast areas. A shift to northeasterly winds on Thursday will help improve air quality across much of the state as high pressure settles into the region. Pollution levels behind the departing boundary are expected to improve, with ozone and PM2.5 generally ranging from upper Good to middle Moderate through the end of the week. We are monitoring ongoing wildfire activity in Canada, which could influence Michigan’s air if smoke drifts southward. At this time, no significant smoke impacts are expected. However, if conditions change and smoke begins moving into the state, air quality may deteriorate, and an updated forecast will be issued before the scheduled Friday update.
| Range | 0 - 50 | 51 - 100 | 101 - 150 | 151 - 200 | 201 - 300 | 301 - 500 |
| Color | ||||||
| Category | Good | Moderate | Unhealthy for Sensitive Groups | Unhealthy | Very Unhealthy | Hazardous |
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Below is a list of counties in Michigan. Click on any county below and you'll get a list of cities where we provide AQ index forecasts.