July 1, 2014

Elevated AQI in Mississippi Valley, Great Lakes and California due to PM 2.5.

The first image, courtesy NOAA HMS, shows the widespread fire activity in the Mississippi Valley and Great Lakes regions of the U.S, stretching from Texas to Florida, with very little smoke aloft. There are sparse fires throughout the Pacific southwest region. There are also plumes in the center of the Plains region which appear to be originating from isolated fires throughout Central Canada. There is also a large smoke plume located in New Mexico, which appears to be of local origin. The next image, courtesy MODIS Aqua, shows an elevated AOD in the Rocky Mountain region, which are most likely due to the smoke plumes moving in a southerly direction from Canada. There is also a large increase in AOD in the Gulf region which may be the resultant of local fires.

The image below, courtesy EPA AIRNow, shows the current AQI for the country for 07:00 EST (23:00 UTC). Most of the eastern half of the U.S. had moderate to U.S.G. AQI conditions. There has been continued moderate AQI values for southern California due to urban aerosols. The NAAPs forecast (not shown), has a large aerosol sulfate aerosol presence located over the southeastern portion of the country. This aerosol load is most likely causing the elevated AOD in these regions. The next image, courtesy GEOS Chem, shows a similar aerosol load moving across the Mississippi Valley and southern Great Lakes regions. Based on the concentration color scale, this aerosol may be more prevalent at the surface in the coming days for the eastern U.S.

Posted by John Sullivan at July 1, 2014 8:17 PM
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