[spiralx]

True, but remember that 4,000 people died in four days in London during the "pea souper" of 1952, when visibility was about a metre or less:

https://www.bbc.co.uk/news/av/stories-42357608/death-by-smog...

https://www.pinterest.co.uk/grahamsrealm/great-smog-of-1952/...