In summer, trees worsen air quality in cities

A new study published in the journal Environmental Sciences and Technology has shown that, in summer, plants may significantly worsen air quality in cities due heat causing an overproduction of volatile organic substances. These substances, combined with nitrogen oxides produced by urban traffic, increase the presence of fine dust particles in the air. The city of Berlin, with 35% of its surface being made of forests and parks, is very affected by this phenomenon.