HC Deb 10 June 1985 vol 80 c314W
Mr. Ron Davies

asked the Secretary of State for the Environment if he will estimate what percentage of ozone formed by reaction between nitrogen oxides and hydrocarbons in the United Kingdom is (a) due to vehicle emissions, (b) due to oil refinery emissions and (c)due to other emissions or natural sources.

Mr. Waldegrave

No. The information on which to base such estimates is not available.