Roadside trees trap asthma-inducing pollutants
By Barbra Rodriguez Aug. 23, 2017 , 2:58 PM
PORTLAND, OREGON—More trees mean cleaner air, right? Not necessarily, suggests a new study looking at the wooded areas next to roadways. Instead, lines of trees known as “greenbelts” might actually trap a common pollutant from vehicle exhaust—nitrogen dioxide (NO2)—boosting on-the-ground levels of the gas up to 21%. That could make breathing hard for bikers and pedestrians with asthma or other respiratory diseases.
https://www.sciencemag.org/news/2017/08/roadside-trees-trap-asthma-inducing-pollutants
