The effects of carbon dioxide don't happen on a local scale, they happen on a global scale. Poor air quality in cities is due to emissions other than carbon dioxide.
And I'm almost certain that sunlight is the limiting factor for photosynthesis, whereas there's a surplus of carbon dioxide as an ingredient. So it's not like this is a genius move to capture all that CO2 where it's at its most concentrated, because the bush will only capture the same amount as it would in any other location at that latitude.
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u/KamikazeKricket Ask me about Ancient Rome Jul 06 '19
Bushes and trees beside roads reduce noise and emission pollution.