"Oak trees, which already let out 800 times more isoprene than maples, emit in especially high volume when the city reaches boiling temperatures in the high 90s as well. They make up 37% of city trees while the sweetgums consist of 17%."
Isoprene mixes with other pollutants to perhaps create asthma and bronchitis.
(NY Post)
So maybe more maples than oak trees in urban areas.
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