FORECAST SUMMARY: Sunday July 2nd, 2023, through Monday July 3rd
OZONE: Ozone concentrations are expected to be in the high Moderate range.
PM-2.5: PM-2.5 concentrations are expected to be in the mid-to-high Moderate range.
FORECAST DISCUSSION:
We have seen great improvement in the overall air quality throughout the day yesterday and into this morning. Some PM-2.5 values were still relatively high on the west side of Michigan near Holland, MI, where the 24-hour average there for PM-2.5 was above the USG level. Everywhere else in Michigan was in the mid-to-high Moderate range. We will see this continue throughout the day and, throughout the week until we get a good airmass change with a strong frontal boundary. These high PM-2.5 concentrations will be aided by firework displays throughout the holiday weekend and heading into the 4th of July, so values may increase above the USG threshold for a few hours but return to the Moderate range.
Ozone may continue to increase throughout the day due to precursors staying within the air into tomorrow, Monday. Some areas in southeast Michigan may increase into the USG threshold but will not be widespread enough to issue an Ozone Air Quality Alert. Ozone levels will be watched throughout the day tomorrow, however.
EXTENDED FORECAST: We look towards Tuesday as Ozone may become a widespread issue across the state.
Next Forecast Update: Monday July 3rd, 2023