Visibility at these times could become as low as a few feet (hence the "London fogs" of movie fame) and when combined with the soot created lethal long-persistence smog: these conditions led to the passing of the UK's "Clean Air Act" which banned the burning of smoke-producing fuel.
He also developed an interest in derelict land reclamation and clean air and was an early environmentalist, through a part-time position with the Ministry of Land and Natural Resources, later the Department of the Environment.
Air pollution in London during the 19th century and early 20th century commonly caused the bricks to receive a sooty deposition over time, turning the bricks greyish or even black, but the removal of contaminants from the air following the passing of the Clean Air Act in 1956, has enabled older buildings to be cleaned and new buildings to retain their natural colour.
The beginning of the month was very foggy, with London suffering its last great smog before clean air legislation and the reduction in the use of coal fires had their full effect.
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