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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 Forecast
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Air Quality Index (AQI)
Good Good
Health Message: None
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AQI - Pollutant Details
Particles (PM2.5)
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Forecast Discussion: FORECAST SUMMARY: Tuesday, January 20th, 2015 through Monday, January 26th, 2015 PM-2.5: 24-hour Fine Particulate concentrations are expected to range between Good and low Moderate through the forecast period. FORECAST DISCUSSION: A low pressure area tracked just south of the state Tuesday, bringing with it snowfalls in the 1-2 inch range across much central and southern Lower Michigan. A second low pressure area will take a nearly identical track late Tuesday into Wednesday, bringing yet another chance for snow, especially across central and southern areas. High pressure then builds in for Thursday and Friday producing quiet weather conditions for the end of the work week. Air quality will be mostly Good through Thursday, but as high pressure settles in, fine particulate could reach low Moderate on Friday. Expended forecast models show a cold front sinking from northwest to southeast across the state late Friday into Saturday. This is a weak front and not much in the way of precipitation is associated with it. This boundary will, however, clear out any fine particulate build-up bringing readings back to the Good range. EXTENDED FORECAST: High pressure settles over the Great Lakes region for Sunday producing quiet conditions. The exact track of a clipper system on Monday is uncertain. The current track keeps it south of Michigan; however, if the system moves further north, snow will be a possibility on Monday. Even with the uncertainty in the weather forecast, I do not expect any significant build-up in fine particulate levels early next week. Levels will remain in the Good to low Moderate range. Forecast updated by Stephanie Hengesbach: Tuesday, January 20th, 2015 Next forecast update: Monday, January 26th, 2015

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