FORECAST SUMMARY: Thursday July 3, 2025, through Friday July 4, 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
FORECAST DISCUSSION:
Holiday travel is in full swing and firework displays are booming across the Great Lakes state. Weather-wise, with the exception of the western Upper Peninsula, one could not ask for a better 4th of July with temperatures well into the 80s, light winds and plenty of sunshine. This is due, in part, to a High-pressure system moving across the region and along the eastern Lake Huron shoreline. Regionally, this pressure system will hang around through Saturday, providing similar weather conditions then as well.
Unfortunately, however, poor air quality is expected as well due to the aforementioned weather set up. For the Lake Michigan shoreline, an Air Quality Advisory for Ozone is in place for Friday July 4 due to light SSW winds, mostly sunny skies and surface temperatures well into the 80s creating a conducive environment for Ozone development. There is a chance of clouds in the early to mid-afternoon but due to the proper ingredients in place, along with firework displays adding more ingredients for Ozone to develop in the atmosphere, USG-level Ozone should be expected. Although this forecast will be updated Friday morning, it can be expected to see USG-level Ozone along the Lake Michigan shoreline on Saturday as well.