Moderate AQIs on Coasts, Smoke over North and East
Air Quality across the country seems better than
it has been in days, with the areas of Moderate AQI
seen in the EPA AQI
loop below left
largely near the coasts, except for some small spots
popping up around the Great Lakes and Plains. Small
areas of Unhealthy for Sensitive Groups and Unhealthy
show up in central California, growing and shrinking
by turns as the day goes on.
The GASP AOD
animation, below right, shows elevated
around central California and southern Texas.
Also visible is a strip of elevated AOD
south from Canada and around the Great Lakes toward
The NWS wind imagery, below left, shows a
counterclockwise circulation northeast of
the Great Lakes, which would explain the
drifting seen in the GASP
animation and the
curl in the smoke seen in the HMS image
below right. This smoke is part of a plume
covering much of Canada, largely originating
in fires in the Northwest Territories and
British Columbia. There is also a small
area of smoke in central California that
might be responsible for the higher AQIs
in that area, as well as several fires in
the Mississippi Valley and Southeast that
might explain Moderate AQIs in this region.
First signs of smoke advecting over Baltimore can be seen in the UMBC lidar
timeseries. The smoke is confined between 3 to 5 km. The boundary layer extended up to 2 km, with ocassionally clouds capping it.
Posted by John Sullivan at July 29, 2014 11:59 PM