Did it look like the vehicle here: http://www.tufts.edu/med/phfm/CAFEH/Progress.html
If so, it's a mobile air quality testing lab. A Tufts study is underway to test mobile vehicle pollution in neighborhoods abutting I-93. They are also testing around Kidder as a comparison of a neighborhood further away that does not suffer the same highway air pollution effects.
Did it look like this?
http://www.tufts.edu/med/phfm/CAFEH/Progress.html
If so, it's a mobile air quality testing lab. A Tufts study is underway to test mobile vehicle pollution in neighborhoods abutting I-93. They are also testing around Kidder as a comparison of a neighborhood further away that does not suffer the same highway air pollution effects.
http://www.tuftsdaily.com/tufts-research-to-explore-health-hazards-of-living-near-highways-1.1727706
http://www.tufts.edu/med/phfm/CAFEH/CAFEH.html
http://www.tufts.edu/med/phfm/CAFEH/pdfs/FactSheetsimp4%5B1%5D.pdf