"We feared demolishing the building and disturbing the soil could release this hidden killer again, " he said.
BBC: Former Turner and Newall factory
But in many Asian and African countries, the indoor use of coal and biomass fuels for cooking and heating is a hidden killer.
CNN: Air pollution kills, but deaths can be prevented
Studies suggest social isolation is associated with a higher rate of death in older people and loneliness is the "hidden killer" of the elderly.
BBC: Is modern life making us lonely?
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