Whoever posts last is best

[Grahamm]

Try looking at the history of the great London smogs, especially that of 1952 which was estimated by the government of the time to have killed at least 4,000 people, although later estimates reckon this could have been up to 10,000.

After that, the first Clean Air Act was passed which, of course, people and power station owners objected to because it meant they had to stop using cheap "nutty slack" and switch to "smokeless" fuels to heat their homes or generate electricity.