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Residents in 49 “upgraded” council houses (social housing) in a deprived area reported fewer asthmatic and other chest symptoms than those in 69 control council houses. The council houses had been randomly assigned to being reroofed, rewired, double glazed, better insulated, and fully centrally heated. (The control houses were upgraded the following year.) The authors conclude that it is feasible to conduct randomised trials on such community-wide interventions.