§ Mr. Harper
asked the Minister of Housing and Local Government and Minister for Welsh Affairs what information he has obtained, when deciding on approval for smokeless zones, on the sulphur content of oil, expressed as a percentage, and on the extent to which percentages differ between the different kinds of oil used.
§ Sir K. Joseph
None. This information would be irrelevant to my consideration of smoke control orders, which under the provisions of the Clean Air Act 1956 are directed only towards smoke prevention.