June 24, 2014

Smoke and moderate AQI in Great Lakes region. Light fires scattered through the gulf coast and texas.

The EPA AirNow AQI loop, below left, shows regions of ModerateAQI across the Mississippi Valley, the Great Lakes, the Southeast, and the Pacific Southwest, with smaller patches in the southern Great Plains, and western Mid-Atlantic. Spots of AQI Unhealthy for Sensitive Groups in Louisiana, southern California, and Florida, with the Louisiana spot turning Unhealthy for a while after noon. The HMS fire and smoke product, below right, shows fires in Arizona, Florida, and Texas that might contribute to the lower air quality in these regions, but doesn't explain the other areas.

NWS ozone imagery, below left, suggests that ozone might be the culprit behind the Moderate AQI in southern California, while NWS wind imagery, below right, indicates that the air wasn't moving a whole lot during the heat of the day in most of the affected areas, allowing aerosol precursors to build up and form aerosols.

Output from the NRL NAAPS model indicates sulfate as a possible cause for the Moderate AQI around the Great Lakes, with dust a likely explanation for the Louisianan areas.

Posted by John Sullivan at June 24, 2014 10:31 PM
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