§ Mr. Dubsasked the Secretary of State for Social Services whether he plans to announce any changes in the maximum blood lead level he considers safe; and on what scientific evidence this is based.
§ Mr. Kenneth ClarkeNo. There is no convincing evidence that harm is caused at blood lead levels below 35 microgrammes per decilitre. A confirmed blood lead level over 25 microgrammes per decilitre, however, suggests the likelihood of exposure to a particular source of lead in the immediate locality which should be dealt with in the usual way.