Air pollution levels vary greatly between different places in a city. This is the finding of a new study which concludes that trees contribute to cleaner air in cities.

The leaves of some tree species emit isoprene as a byproduct of photosynthesis, though no one is quite sure why. With oaks, emissions tend to increase exponentially with heat, at least until air ...

A mature leafy tree can produce enough oxygen for 10 people to inhale in a year. In addition, trees can filter pollutants out of the air. Yet trees are not seen as allies when it comes to air quality.

Experts say both real and fake Christmas trees can change the air you're breathing indoors. Here's how. By Jillian Wilson Updated March 12, 2025 10'000 Hours via Getty Images ...

Nearly two years after the devastating wildfires swept through Lahaina and Kula, one of Lahaina's most well-known landmarks ...