§ Mr. Muddasked the Secretary of State for the Environment if he will indicate. respectively, the number of private sector and public sector houses under construction in the county of Cornwall in the month of January in each of the years 1969, 1970, 1971, 1972, 1973, 1974, 1975. 1976 and 1977.
§ Mr. ArmstrongThe information asked for is set out below: may be released to atmosphere when they are burnt or heated—for example, when burning coal or making bricks. Not many industrial discharges to rivers and waterways contain significant quantities of fluoride, but where it is thought to be significant it is specifically controlled. No figures of the total weight of fluorides emitted either to atmosphere or to rivers and waterways are readily available.