Ultrafine particle size distributions near freeways: Effects of differing wind directions on exposure.

ABSTRACT: High ambient ultrafine particle (UFP) concentrations may play an important role in the adverse health effects associated with living near busy roadways. However, UFP size distributions change rapidly as vehicle emissions dilute and age. These size changes can influence UFP lung deposition rates and dose because deposition in the respiratory system is a strong function of particle size. Few studies to date have measured and characterized changes in near-road UFP size distributions in real-time, thus missing transient variations in size distribution due to short-term fluctuations in wind speed, direction, or particle dynamics. In this study we measured important wind direction effects on near-freeway UFP size distributions and gradients using a mobile platform with 5-s time resolution. Compa

SUBMITTER: Kozawa KH 

PROVIDER: S-EPMC3886859 | biostudies-literature | 2012 Dec

REPOSITORIES: biostudies-literature