 Yeah, so the problem here is that, first of all, perceptually we habituate, right? When things, let's say pollution, if there's pollution in the air constantly, we kind of get used to it and we don't really notice it's in the air. There's a really interesting survey that shows that in the UK, only 10% of people rate their air quality as poor, despite the fact that pollution reaches legal limits in 88% of UK regions.