Pollution Reduction

The TREE Study explored how roadside barriers—especially trees and other green infrastructure—could reduce population exposure to traffic-related air pollution near highways in Atlanta, Georgia. The E3 Lab monitored black carbon (BC) mass concentration, particle number concentration (PNC), and the size distribution of ultrafine aerosols. Our sample sites encompassed differing types of roadway barriers including simple chain-link fences, sound walls and vegetative barriers. We estimate the effect of barrier type on the ratio of particle concentrations at the comparison site relative to the roadside site while controlling for meteorology and traffic indicators. 

This research strengthens the evidence showing that green infrastructure—like trees—can have beneficial effects on air quality in near-roading settings where many communities live, work and play.

Publication: Read the publication here