Liverpool area, early 60s: we had those thick yellow fogs less often than in London, but with added ingredients from the chemical works up the estuary.

My grandfather would be hospitalised in the winter months with bronchitis - on one occasion spending time in an oxygen tent to aid his breathing. Our teacher at school suggested we breathe through handkerchiefs on the way to school if there was a fog. Impressive quantities of tar.

Much better now.