The next time you're hunting for an apartment or a house, maybe you should count the number of trees on the block.
A new study found that living on a street with 10 more trees than average (both on the street and in people's yards) makes you feel as healthy as if you were seven years younger—or as if you were making an extra $10,000 a year.
Researchers already knew that living around green spaces makes people happier, safer, and that greenery can help reduce diseases like asthma by sucking up pollution. But the new study goes deeper to examine the benefits tree by tree.
"We felt that there is a need to quantify the relationship between individual trees and health in a way that the size of this association can be assessed and compared with other well-known factors such as income and age," says Omid Kardan, a doctoral student at the University of Chicago and lead author of the study. "This way, planners will have a better sense of this relationship and hopefully consider this factor more seriously in their urban development and public health policies."
The researchers combed through maps of 530,000 trees on streets in Toronto, and combined that with satellite images of trees in people's backyards. Then they compared the number of trees to the health of people on each block.
Because Canada has universal healthcare, it was easier to eliminate differences neighbors might receive in treatment. The researchers were also able to control for things like income, age, and education. Trees, it turned out, still made a difference.
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