Contributions of aircraft arrivals and departures to ultrafine particle counts near Los Angeles International Airport

摘要: Abstract Background While commercial aircraft are known sources of ultrafine particulate matter (UFP), the relationship between airport activity and local real-time UFP concentrations has not been quantified. Understanding these associations will facilitate interpretation exposure health risk implications related to aviation emissions. Objectives We used time-resolved data along with flight meteorological information determine contributions departures arrivals concentrations. Methods Aircraft near-field continuous (≧ 6 nm) were measured at five monitoring sites over a 42-day field campaign Los Angeles International Airport (LAX). developed regression models as function time-lagged landing take-off operations (LTO) activity, in form or weighted by engine-specific estimates fuel consumption. Results Our demonstrate strong association elevated total end departure runway, diminishing magnitude impacts distance from source. LTO contributed median (95th, 99th percentile) concentration approximately 150,000 particles/cm3 (2,000,000, 7,100,000) monitor versus 19,000 particles/cm3 (80,000, 140,000), 17,000 particles/cm3 (50,000, 72,000) for monitors 250 m 500 m further downwind, respectively. Conclusions demonstrated significant activities close proximity runways, evidence rapid plume evolution near field. methods can inform source attribution dispersion modeling outputs.