{"id":28488,"date":"2026-03-26T22:16:24","date_gmt":"2026-03-26T14:16:24","guid":{"rendered":"https:\/\/smartairfilters.com\/?p=28488"},"modified":"2026-04-04T16:22:26","modified_gmt":"2026-04-04T08:22:26","slug":"best-trees-improving-air-quality","status":"publish","type":"post","link":"https:\/\/smartairfilters.com\/en\/blog\/best-trees-improving-air-quality\/","title":{"rendered":"What\u00a0Are\u00a0the\u00a0Best\u00a0Trees\u00a0for\u00a0Reducing\u00a0Air\u00a0Pollution?"},"content":{"rendered":"

While most of us believe that trees and green space can improve air quality and filter out pollutants, is this truly the case? And which tree is best for the job?<\/p>\n\n\n\n

Trees aren\u2019t Filters <\/h2>\n\n\n\n

First, we need to stop thinking that trees are filters. They\u2019re not. The biggest effect they have on particles is to serve as a place for particles to land. They\u2019re more like a runway than a filter.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

And why would they be filters? Why would trees have evolved to suck up our pollution?<\/p>\n\n\n

\n
\"Trees<\/figure><\/div>\n\n\n

Effect of Greenspace on Particulate Air Pollution<\/h2>\n\n\n\n

Let\u2019s get to the numbers. Scientists estimated how much greenspace in major cities reduces PM2.5<\/a> (other studies: 1<\/a>, 2<\/a>). PM2.5 is particles that come from things like burning coal. These particles can lodge deep in our lungs.<\/p>\n\n\n

\n
\"pollutant<\/figure><\/div>\n\n\n

The results were underwhelming. Across 10 US cities, the effects ranged from 0.05% to 0.24%.<\/p>\n\n\n\n

That\u2019s NOT 24%. No, that\u2019s as much as <\/strong>a quarter of one percent. Party time!<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

Let\u2019s look at the greenest city in the study, Atlanta. Atlanta is 52.1% covered in trees!<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

Yet even that high amount of tree cover reduces PM2.5 pollution by 0.24%, according to the study. If Atlanta wanted to reduce pollution by a modest 10%, they would have to cover the entire city TEN TIMES over in trees.<\/p>\n\n\n\n

Little Particle Runways<\/h2>\n\n\n\n

That tiny effect mostly comes from when particles land<\/a> on the tree, NOT the tree sucking up particles.<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

But hey, researchers found that some trees are better runways<\/a> than others, so we can talk about better trees and worse trees.<\/p>\n\n\n

\n
\"Effective<\/figure><\/div>\n\n\n

Scientists in the UK plucked leaves from different kinds of trees, washed them, and measured how much particulate was on them. Pine trees were the clear winner. They captured about twice as much particulate as leafy trees because of their large surface area and the arrangement of the pine needles. The researchers also found that broad-leaved trees with rough leaf surfaces can capture more particles.<\/p>\n\n\n\n

The Gold Medal: <\/strong>Pine trees were the clear winner. They captured about twice as much particulate as leafy trees because of pine needles have a larger surface area and a different kind of arrangement.<\/p>\n\n\n

\n
\"pine<\/figure><\/div>\n\n\n

Silver Medal: <\/strong>Another factor that mattered was having a rough surface on the leaves. The researchers found that broad-leaved trees with rough leaf surfaces capture more particles. For example, the whitebeam tree has rough leaves and captured more than twice as much as the poplar trees, which have smooth leaves.<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

<\/p>\n\n\n

Bottom Line<\/div>
Bottom Line: The Best Trees for Improving Air Quality<\/div>
<\/p>\n

Pine trees and trees with rough-textured leaves captured the most air pollution particles, but trees overall have a small effect on PM2.5 pollution.\n<\/div>

Smart Air<\/div><\/div>\n\n\n\n

<\/p>\n\n\n\n

P.S. What about other kinds of pollution?<\/strong><\/p>\n\n\n\n

Particulate is an important pollutant, but it\u2019s not the only type of air pollution. Perhaps trees have a bigger effect on gas pollutants like ozone or NO2. I haven\u2019t seen studies on gas pollutants. There\u2019s also CO2, which isn\u2019t so directly harmful, but warms our planet. Trees help store carbon dioxide<\/a>.<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

P.P.S. Other uses for trees: Blocking sandstorms<\/strong><\/p>\n\n\n\n

In fairness, trees can help in other ways. One way China used trees to fight air pollution is by blocking sandstorms<\/a> from blowing into Beijing.<\/p>\n\n\n\n

Trees can also keep cities cooler<\/a>, which could reduce energy use and therefore pollution. Trees could also reduce ozone pollution because ozone forms more when it\u2019s hot out<\/a>.<\/p>\n\n\n\n

<\/p>","protected":false},"excerpt":{"rendered":"

While most of us believe that trees and green space can improve air quality and filter out pollutants, is this truly the case? And which tree is best for the job? Trees aren\u2019t Filters First, we need to stop thinking that trees are filters. They\u2019re not. The biggest effect they … <\/p>\n

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