July 29, 2022

Breathing Better in Cities & The Many Miracles of Street Trees

It was over ten years ago that a study  called “Sustaining America’s Urban Trees and Forests worked out that one single immature street tree had the same cooling impact as five air conditioners in separate rooms operating twenty hours a day. Simply increasing street trees may bring down summer heat significantly in cities.

Increasing tree canopy in cities not only fights poor air quality and heat islands, trees can reduce the hourly ozone by 15 percent, sulfur dioxide by 14 percent and particulate matter by 13 percent.

Data shows that one healthy tree can remove 300 pounds of carbon dioxide from the air annually. Trees in the United States are estimated to remove 784,000 tons of carbon dioxide annually, a 3.8 billion dollar equivalent value.

Steve Mouzon’s post in CNU.org  of two years ago shows that “evapotranspiration” from trees cool heat by 2 to 9 degrees. So how do you cost the value of a street tree?  Dan Burden estimates the lifetime benefits of a single street tree as $90,000, and a street that is full of street trees raises the value of the adjacent housing by $22,000 a unit.

There is also some quirky weirdness: there is less crime on streets that are lined with trees. But think of it: the more street trees, the more walkable and accessible and cared for, meaning there are more eyes on the street as well as more foot traffic.

Add in one more benefit for Metro Vancouver: every street tree absorbs one inch of stormwater, so installing and watering street trees pays off as part of stormwater infrastructure.

But perhaps the most important aspect of street trees is the health of children: A study just released that looked at 3,000 city kids in Porto Portugal found that children who moved to live close by green spaces had better lung capacity than children who lived further away. Even accounting for other factors such as the fact that babies do not spend a lot of time outdoors, moving to a greener area by the time you are ten significantly improves health outcomes. Do trees reduce stress, or is there an impact on children’s microbiome ,the name for the different bacteria that live on human forms?

Here’s a YouTube video from the City Beautiful channel where a Sacramento commentator illustrates why street trees change livability and community.

imageoftrees:TonyValente

 

 

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  1. Thank you for this. I think the region needs to be on an urgent campaign to put more trees everywhere ASAP. There should be a requirement to plant a minimum number of trees on each SF lot based on overall size. There are a shocking number of south facing front yards on my street with no trees, even though our street trees are relatively small so they don’t provide enough shade to cover adjacent homes. I think there is a cultural aspect to this choice that needs to be investigated further and multi-lingual resources made available to help residents understand the benefits of more trees in the City. I have the feeling that too many residents consider them more of a nuisance than a benefit, based on the barren yards in my neighbourhood.

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