How romanticised images of London fog shaped the way we see polluted air

By Michelle Henning, Chair in Photography and Media, University of Liverpool

Researching in the archives of the British photographic company Ilford Limited, I recently came across a curious memo pasted into an experiment book by one of the company’s chemists. Dated January 19 1923, it appears as a small interruption in the page: a practical instruction that “in future, coating of any kind of emulsion must not be commenced or proceeded with during a fog”.

This brief directive was my first clue to a connection between the photographic term “fogging” and the noxious

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