March 4, 2014

Moderate AQI across the Midwest region. Fires in the Southeast region.

Clouds cover most of the U.S., as seen in the Aqua MODIS imagery below (top left), so satellite measurements aren't going to provide much information about air quality. Surface observations are unimpaired, and a collection of these from the EPA (top right) indicates Moderate AQI levels across the eastern part of the midwest, along the Mason-Dixon line up into Pennsilvania, southern California, and northern Idaho, with one station reporting AQI levels Unhealthy for Sensitive Groups (bottom left). HMS Fire and Smoke Analysis imagery (bottom right) indicates patches of fires along the Kansas - Missouri border and in central Florida.

What tropospheric NO2 data is available from OMI indicates that Secondary Nitrate may be behind the elevated AQI in the east. The low wind speeds across the eastern United States indicate that whatever aerosols are in the area are going to stay for a while with little to move them out.

Posted by John Sullivan at March 4, 2014 11:29 PM
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