My current perspective is from beyond the arctic circle (where I am visiting my dad, but a London dweller too).
I am old enough to remember Chernobyl. Even now we have to be careful not to eat too much reindeer as the lichen took a hit of radiation. There are increased levels of (thyroid) cancers in the population whose staple is reindeer. Trade in reindeer meats have also taken a hit.
Air pollution is not much of a problem up here, other than in spring, when the studded tires are rubbing on the asfalt, causing dust in the air. By law the studded winter tires must be changed between 1st and 12th May.
Some factories release fish related stuff into the sea, and it smells for a couple of days, no doubt harming the oceans.
Pollution should be tackled on all fronts.
However, my youngest son was diagnosed with Asthma when he was one. 2 years later we moved here, and he could stop using his inhalers within a month of staying in the north of Norway. In the three years we lived here my children did not need antibiotics even once. They had no respiratory problems at all. Not one tummy bug. They had 0 absence from school and nursery. Back in London they both need antibiotics every three months for respiratory illnesses, and they have had a series of stomach bugs.
From a health perspective, I know where I would rather live. A shame dh cant find work here.