 The Clean Air Act 1956 waiva mutemo weParamende yeUnited Kingdom wakagadzwa zvikurukuru semhinduro kuLondons Great Smog ya1952. Yakanga ichitsigirwa neHurumende yeDzimba neHurumende yeNzvimbo muEngland uye Dhipatimendi reZveutano reScotland, uye yakanga iri kushanda kusvikira muna 1993. 