HC Deb 12 January 1990 vol 164 c769W
Mrs. Ann Taylor

To ask the Secretary of State for the Environment what proportion of smoke in urban areas is estimated to come from diesel vehicles.

Mr. Trippier

Figures for emissions of black smoke from diesel vehicles have not yet been finalised, but will be published for the first time in the Department's annual digest of environmental protection and water statistics early in 1990.