Urban trees have potential to damage air quality.

Greengage

A recent report shows that planting Urban trees can worsen Air quality due to VOcs being released.
http://www.es.lancs.ac.uk/people/cnh/UrbanTreesBrochure.pdf

http://www.irishtimes.com/news/science/the-city-trees-that-pose-a-threat-to-human-health-1.2548050

medieval knievel · Posted: Thu Apr 21, 2016 7:49 am Post subject:

interesting to note that the trees with the potential to worsen air quality include mainly trees you don't often see planted in urban areas - oaks and willows.