I wonder if the effects of exercise like running or cycling are offset by doing them on or next to a main road in a city

@david fear of carbon monoxide and diesel particulates, yeah 😄

@mgdm Generally the accepted school of thought is that the benefit of the activity outweighs the negative of fumes/etc.

Unless it's smoggy like in some Chinese cities/etc. In that case, don't go outside.

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