On 16/08/2018 12:33, NY wrote:
"Nightjar" wrote in message
...
....
Gosh, I hadn't realised that coal smoke was a problem in London as far
back as 1306 with the *very* much smaller number of houses that long ago.

The density of housing was probably at least as great, so fewer houses
would mean a smaller area was affected, but to no lesser degree. Edward
I considered it enough of a problem to make the burning of coal a
capital offence.

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Colin Bignell