/tags/smog Smog en-US Copyright Fri, 26 Apr 2013 17:30:00 GMT /environment/2013-04-26/study-shows-how-trees-help-create-smog A new study from researchers at the University of North Carolina at Chapel Hill has revealed exactly how trees play a role in smog production. The… Fri, 26 Apr 2013 17:30:00 GMT /environment/2013-04-26/study-shows-how-trees-help-create-smog Laura Candler