Vehicle emissions
. "Reducing emissions from in-use vehicles: an evaluation of the Phoenix inspection and maintenance program using test results and independent emissions measurements." Environmental Science & Policy 4.6 (2001) 359–376.
. "Evaluating the long-term effectiveness of the Phoenix IM240 program." Environmental Science & Policy 4.6 (2001).
. "Use of remote sensing measurements to evaluate vehicle emission monitoring programs: results from Phoenix, Arizona." Transportation Research Part D 6.2 (2003).
, , , and . "Short-term emissions deterioration in the California and Phoenix I/M programs." Transportation Research Part D: Transport and Environment 9.2 (2004) 107–124.
, , , , , and . "Traffic-related Air Pollution near Busy Road: The East Bay Children’s Respiratory Health Study." American Journal of Respiratory and Critical Care Medicine 170.5 (2004) 520–526.