Air Quality Advisory Day were forecasted in Minneapolis-St. Paul, MN, Liberty/Clarion, PA and Baltimore, MD. The overnight Code Orange PM2.5 concentrations reported along Minnesota and Wisconsin due to light rain, fog, and mist overnight that enhanced particle production in these…

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Air Quality Advisory Day in Minnesota, Pennsylvania and Maryland. Coarse particulate over Baltimore.

PM2.5 air quality conditions worsened today in the upper Midwest, with Code Orange (Unhealthy for Sensitive Groups) readings widespread across Minnesota, Wisconsin, Illinois, Indiana, and Ohio. Elsewhere in the nation, including the Northeast and West Coast, air quality was generally…

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Code Orange PM2.5 Air Quality in the Midwest

The air quality (AIRNow; top, left) in almost half the country was mostly in the moderate range. In the upper Midwest – Minnesota and Wisconsin – unhealthy levels (for sensitive groups) of PM2.5 were recorded in the morning and it…

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Air quality worsens in the US (Midwest/Central/South/Northeast)

The fires in Central/Southern US which have been reported here since last week are still showing signs of smoke over the Midwest states as can be seen in today’s MODIS Aqua images (top, left). Also in this picture we see…

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Smoke still visible over the Midwest

A very visible plume of smoke has passed over Lake Superior and upper Lake Huron today. The composite map of PM2.5 from AIRNOW, fire detects from the NOAA HMS site, and MODIS Terra from MODISToday indicates that the smoke is…

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Smoke from the plains states moves through the Great Lakes