July 8, 2014

Moderate AQI across Eastern U.S., Smoke from Canada Drifting South

The EPA AQI loop, below left, shows Moderate AQI stretching from the Northeast through the Mid-Atlantic, the Great Lakes, the Southeast, and the Mississippi Valley and into the Plains States, with other patches in the Pacific Southwest into the Pacific Northwest, in the Rocky Mountains, and the northern Plains as well as spots of Unhealthy for Sensitive Groups popping up in the Southeast, Northeast, and Pacific Southwest. NRL NAAPS surface sulfate imagery, below right, indicates that to be a likely cause for the swath of Moderate AQIs across most of the eastern part of the country.

HMS fire and smoke imagery, below left, shows smoke drifting south from fires in the Northwest Territories between the Great Bear Lake and the Great Slave Lake. This shows up rather nicely in the MODIS Terra AOD imagery below right, and might explain the Moderate AQIs in the northern Plains. The high AQIs in the east also show up in the elevated AOD off the coast.

Posted by John Sullivan at July 8, 2014 11:59 PM
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