August 5, 2014

Smoke across East and Northwest

The EPA AQI loop, below right, shows a swath of Moderate AQIs stretching west from the Appalachians, past the Great Lakes, and into Texas. Parts of this area are also crossing the Appalachians and into the coastal areas of New England, the Mid-Atlantic, and the Southeast. There is also Moderate AQI across the Pacific Northwest and Pacific Southwest, reaching into Unhealthy for Sensitive Groups in southeast Oregon and north-central California. The MODIS Terra image below on the right shows elevated AODs in the Pacific Northwest and northwest of the Great Lakes that may be related, but much of the rest of the regions of lower air quality are cloud-covered.

The HMS imagery, below left shows light to medium smoke over the Pacific Northwest, Pacific Southwest, Rocky Mountains, and Great Lakes, with additional light smoke over New England, the Mid-Atlantic, the Southeast, and the Mississippi Valley. These plumes of smoke likely explain the poor air quality in those regions. Today lidar timeseries shows a high concentration of particle pollution near the surface due to high pressure system over the region that is limiting ventilation in the boundary layer. During the daylight hours, times after 10:00 UTC (6:00 am local time) the boundary layer rose up to 2 km.

Posted by John Sullivan at August 5, 2014 11:59 PM
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