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>Well, they are a major source of smog in some areas

I'm skeptical of this. Are you saying there's a forest somewhere that's giving people asthma attacks?

Maybe he's referring to pollen? IDK, just guessing. I assume even if he's partially right that some species of trees are better than others.

Pollen, I believe, is that they're referring to.

PBS Terra on YouTube recently did an episode about the blue haze over forests in (IIRC) Tennessee. Trees emit VOCs that make the air hazy. The blue haze from trees was being replaced by brown haze from industry.

Maybe tree smog is safe to breathe, but trees do create smog in at least some places.

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