It's good that pollution's immense consequences on public health get more attention, so I like the piece for that. Though a little puzzled about why the author

It's good that pollution's immense consequences on public health get more attention, so I like the piece for that. Though a little puzzled about why the author approached, for his main source, an earth scientist and physicist, not someone with an epidemiology background. No disrespect to that source, whose work sounds important and very interesting.