FORECAST SUMMARY: Friday July 4, 2025, through Monday July 7, 2025
Ozone:
Ozone concentrations are expected to be in the Moderate to USG range.
PM-2.5:
PM-2.5 concentrations are expected to be in the Moderate to USG range.
Air Quality Advisory for Ozone on July 4, 2025, for the following counties:
Allegan, Berrien, Kent, Muskegon, Ottawa, Van Buren
Air Quality Advisory for PM-2.5 on July 4, 2025, for the following counties:
Livingston, Macomb, Monroe, Oakland, St. Clair, Washtenaw, Wayne
FORECAST DISCUSSION:
Two Air Quality Advisories are in place today, July 4th, one in west Michigan along the Lake Michigan shoreline for Ozone, and the other is in metro Detroit for PM-2.5.
The environment over Lake Michigan and along the Lake Michigan shoreline is primed for Ozone development. These conditions will persist tomorrow, Saturday, so the current Air Quality Advisory for Ozone will be extended through Saturday, July 5th. Surface temperatures will increase into the low-to-mid 90s with winds shifting to southwesterly, both near the surface and in the upper-levels. Additionally, upper-level temperatures will be near twenty degrees Celsius, which is ideal for the Ozone photochemical reaction to occur. These conditions will be present over southeast Michigan as well, mixing with a potentially dirty atmosphere, so an Air Quality Advisory for Ozone will be issued for the metro Detroit area tomorrow, Saturday.
For PM-2.5, the current Advisory in place will be extended through Saturday, July 5th. Light winds will continue through today, Friday, and last until early Saturday afternoon when winds are expected to pick up. PM-2.5 concentrations are expected to improve throughout Saturday afternoon as winds pick up.
Come Sunday, a Low-pressure system and associated frontal boundary will cross over the state bringing NNW winds and a chance of rain showers. This will clean out the atmosphere and improve overall air quality through Monday, July 7th.
EXTENDED FORECAST:
Air quality looks Good to start off the next week.