The Dark Smoke (Permitted Periods) (Vessels) Regulations 1958

S.I. 1958/878

The Clean Air (Height of Chimneys) (Exemption) Regulations 1969

S.I. 1969/411

The Clean Air (Arrestment Plant) (Exemption) Regulations 1969

S.I. 1969/1262

The Control of Atmospheric Pollution (Appeals) Regulations 1977

S.I. 1977/17

The Control of Atmospheric Pollution (Exempted Premises) Regulations 1977

S.I. 1977/18

The Control of Atmospheric Pollution (Research and Publicity) Regulations 1977

S.I. 1977/19