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Air Purifying Trees

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I am looking for the best air purifying trees for Zones 7a or 7b? All I can find online is about the best indoor air purifying plants. (Yes, I understand all trees will purify but I'm wondering if there is a list of the air purifying champs?)
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Location: Western Canadian mtn valley, zone 6b, 750mm (30") precip
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I'm hoping one of these may help you, or be a jumping-off point toward the info you need...
several trees are mentioned, though the brief list seems like it'd be climate limited

I’ve had good results when seeking many answers to tree-related questions on this site:

These people definitely know the tree topic — and since they’re active both in Africa and in the UK, they likely would have knowledge for a zone with conditions like yours

BTW, I'm in zone 6, with the forest quite near, but still near our house we've planted some trees (such as a hard-maple cousin to sugar maple), a weeping willow, and some spruces that I'm glad we have for shade and for the influence on the air.
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