Key term for OCR GCSE History B, used in Britain since c. 1900.
Specific urban areas created by the 1956 Clean Air Act where it was illegal to emit smoke from a chimney unless using an authorised, clean fuel.
Smokeless Zones appears in OCR GCSE History B revision content for The People’s Health (c.1250–Present), especially Britain since c. 1900 and Government involvement.
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