On: More trees reduce premature deaths in cities

[noname120]

Correlation ⇏ causation.

Possible confounding factor: green cities are the result of environmentally-friendly policies which also happen to reduce city pollution.

[carapace → noname120]

Yeah, I'm an eco-nut but my first (well, second) reaction was, "Is it that proximity to trees is roughly inverse to proximity to cars and other pollution sources?"

I was just reading about nanoparticle pollution: https://www.bbc.com/future/article/20191113-the-toxic-killer...

Evidently it's both really bad and pretty localized (exposure levels seem to drop rapidly with distance from car traffic, for example.)