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AQI: Good (0 - 50) AQI: Moderate (51 - 100) AQI: Unhealthy for Sensitive Groups (101 - 150) AQI: Unhealthy (151 - 200) AQI: Very Unhealthy (201 - 300) AQI: Hazardous(301 - 500) Action DayAction Day
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Air Quality Index (AQI)
Moderate Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors.
Data Not Available
AQI - Pollutant Details
Particles (PM2.5)
Data Not Available
Forecast Discussion: FORECAST SUMMARY: Wednesday, September 2nd, 2015 through Thursday, September 3rd, 2015 Ozone: 8-hour Ozone is expected to be mostly Moderate; with still a small chance for an isolated USG reading. PM-2.5: 24-hour Fine Particulate concentrations will remain Moderate. FORECAST DISCUSSION: The clear part of this forecast will be the warm temperatures and increased humidity levels which will continue the next few days. The question mark is how much cloud cover and precipitation will we get from a weak cold front dropping in from the northwest. Clouds were in place early Wednesday across much of the Upper Peninsula and precipitation was falling in western and central areas. As this boundary sinks southeast, clouds and associated precipitation will move into Lower Michigan later Wednesday, lasting into Thursday. Again, this isn’t a strong front and chances for precipitation are not high. In fact, some areas may remain precipitation free through Thursday. Also, there isn’t a “clean” wind shift after the boundary passes. Winds both at the surface and upper levels remain rather light but will change to more of a light northeasterly to southeasterly direction by Friday. Chances for precipitation with this system may linger across the southern part of the state Friday. As for air quality, fine particulate levels continue to run Moderate and that is where readings will stay over the next few days. For ozone, one site downwind of the Detroit area did reach low-end USG Tuesday and several monitors increased into the Moderate range. For Wednesday, much of the same is expected. There is a small chance a monitor could hit low-end USG but if that did happen I expect it to be along the West Michigan lakeshore area, not in the southeast. However, I think most areas will remain Moderate for ozone. Moderate readings will continue in most areas Thursday but locations that do see more in the way of clouds and precipitation could be in the Good range. With so much uncertainty in the forecast over the next several days there will be a threat for increased air pollution through the weekend. Therefore, the regional forecast group has decided to keep with a daily forecast call, likely through Sunday. EXTENDED FORECAST: Extended models still show the warm/muggy forecast continuing until early next week when a stronger cold front possibly moves in. Until then, chances for increased pollution will continue... Forecast updated by Stephanie Hengesbach: Wednesday, September 2nd, 2015 Next forecast update: Thursday, September 3rd, 2015

Current Conditions
Air Quality Index (AQI)
observed at 8:00 EDT
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion.
AQI - Pollutant Details
Particles (PM2.5) 88 Moderate
Particles (PM10) 52 Moderate
Ozone 5 Good

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