Within the past few weeks, two additional sensors have been installed, one in the heart of Washington, DC and another on the eastern shore of the Chesapeake Bay.
 
The first one is at the University of Maryland Center for Environmental Science at the Horn Point Lab in Cambridge, MD. The sensor package was placed near a picnic site on the banks of the Choptank River just inland from the Chesapeake Bay.

The second is located at one of the District of Columbia’s Department of Energy and the Environment’s air quality monitoring locations. This is located just off of 295 at Benning Road.