FORECAST SUMMARY: Monday June 29th, 2026, through Tuesday June 30th, 2026
Ozone:
Ozone concentrations are expected to be in the Unhealthy for Sensitive Groups (Orange AQI) range.
PM-2.5:
PM-2.5 concentrations are expected to be in the Good (Green AQI) to Moderate (Yellow AQI) range.
Air Quality Alert for June 29 and June 30, 2026
June 29, 2026, Alert counties:
St. Clair, Livingston, Oakland, Macomb, Washtenaw, Wayne, Monroe
June 30, 2026, Alert counties:
Muskegon, Ottawa, Kent, Allegan, Van Buren, Berrien
FORECAST DISCUSSION:
The transition from June to July is turning out to be a rather busy weather week with Extreme Heat Watches and Warnings across the state, and now, Air Quality Alerts. An Air Quality Alert has been issued today for portions of southeast Michigan due to Ozone having the potential of reaching and exceeding the Unhealthy for Sensitive Groups range. With yesterday, Sunday, being a ramp up day for Ozone, lighter winds today may allow for Ozone to develop in and around metro Detroit.
As we move into tomorrow, Tuesday, an Air Quality Alert has been issued for west and southwest Michigan due to Unhealthy for Sensitive Groups concentrations of Ozone being expected. Model guidance is in agreement with a plume moving ashore from over the lake as winds shift to more southwesterly flow tomorrow. The hot and sunny conditions along with the wind direction will allow for the photochemical reaction that creates Ozone to take place and impact the areas listed above. As mentioned in prior forecast updates, the kicker this week will be how Ozone interacts with the rather high dew points. In recent years, we have observed Ozone does not typically produce as it otherwise would when dew points reach or exceed 70 degrees, which is expected this week. To err on the side of caution, however, Alerts are being issued today and tomorrow, but it will be interesting to observe what Ozone does this week as there is the potential for additional Alerts being issued later this week.
EXTENDED FORECAST:
Hot and humid days persist throughout this week with the potential of additional Air Quality Alerts on Wednesday and possibly Thursday. This forecast will be updated each day this week due to that possibility.
Next Forecast update: Tuesday June 30th, 2026