Isn't the concept of pollution highly subjective?
Anyone who wishes to claim pollution is always a subjective concept is welcome to drink a few gallons of water from Lake Karachay.
From https://en.wikipedia.org/wiki/Lake_Karachay
> Today the lake is completely infilled, acting as "a near-surface permanent and dry nuclear waste storage facility."
Putting the above aside though, I would disagree. Everything is subjective except math (and even there, I think there’s a debate), but I would definitely not classify pollution as _highly_ subjective, that makes it sound it belongs to the category of things that particularly lack consensus, which is definitely not the case amongst the scientific community. Not to say there’s 100% agreement on all things, but I think there’s a broad consensus.
But consider, I dunno, salt? A little built of salt in the environment is normal. But a whole lot of it is pollution.
And comparison of different, potentially codependent variables, is notably relevant.