Notes
Peer-reviewed study published in Environmental Science & Technology (American Chemical Society, 2014) by Neelakshi Hudda, Tim Gould, Kris Hartin, Timothy V. Larson, and Scott A. Fruin (USC Keck School of Medicine / University of Washington) measuring spatial patterns of particle number (PN) concentrations downwind from Los Angeles International Airport (LAX). Using mobile monitoring platforms (MMP) over 29 days in 2011–2013, the study found at least a 2-fold increase in PN concentrations over an area of ~60 km² extending 16 km downwind, and a 4- to 5-fold increase to 8–10 km downwind, with concentrations exceeding 75,000 particles/cm³ at 8 km — surpassing average freeway PN concentrations in Los Angeles. The equivalent freeway impact length was estimated at 280–790 km, compared to 1,500 km total LA freeway network. Pollutants measured include PN, BC, NO, NO2, NOx, and particle-bound PAH (PB-PAH) via Ecochem PAS instrument.