Notes
Peer-reviewed study by Hudda, Simon, Zamore, Brugge, and Durant (Tufts University, Somerville Transportation Equity Partnership) published in Environmental Science & Technology (2016), examining aviation emission impacts on ambient ultrafine particle number concentrations (PNCs) at three monitoring sites within 7.3 km of Logan International Airport (Boston, MA). PNCs measured via condensation particle counters (CPCs, TSI model 3783/3775) at Chelsea (4.0 km NW), Dorchester/Boston Globe (6.5 km SW), and Roxbury EPA-STN (7.3 km SW) sites. Finds PNCs 2-fold and 1.33-fold higher when winds from airport direction at 4.0 and 7.3 km sites respectively; PNCs positively correlated with flight activity and increased with wind speed during airport-direction winds (consistent with buoyant aircraft exhaust plumes), while CO, black carbon, NO, NO2, NOx, SO2, and PM2.5 decreased with wind speed (indicating roadway traffic dominance). Ultrafine particles (UFP, <100 nm) from jet aircraft extend aviation impact tens of kilometers downwind encompassing populated residential communities.