Section 3(1)

In this Act “dark smoke” means smoke which, if compared in the appropriate manner with a chart of the type known on 5th July 1956 (the date of the passing of the Clean Air Act 1956) as the Ringelmann Chart, would appear to be as dark as or darker than shade 2 on the chart.

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Source: legislation.gov.uk · retrieved 2026-07-30