HC Deb 22 December 1971 vol 828 c349W
57. Mr. James Hill

asked the Secretary of State for the Environment what scientific advice is available to his Department to show that liquefied petroleum gas is a less dangerous source of atmospheric pollution than petrol or diesel fuels; and what steps he will take to encourage its use by public transport and other large users.

Mr. Peter Walker

Evidence available to my Department shows that vehicles running on liquid petroleum gas emit less toxic pollutants than vehicles with uncontrolled petrol engines but are not superior in that respect to diesel-engined vehicles. While I will certainly do nothing to discourage its use, the reduction of pollution can be more effectively achieved by setting appropriate standards for conventionally fuelled vehicles.