Wig Zamore, researcher with the Somerville Transportation Equity Partnership, is featured in this very informative video about near roadway air pollution and poverty in Somerville, Massachusetts. Check out their mobile monitor in action.
Earlier this year, Wig was workshop presenter at the New Partner for Smart Growth Conference in Baltimore, and speaker at a Diesel Health Project event in the Kansas City area.
Wig has a masterful level of knowledge about traffic related air pollution, and I highly advise following the work of him and his partners, some noted in the article linked below.