Building materials and environmental health: radon in Hong Kong

The origin and health effect of radon are first identified. In Hong Kong, the main contribution to the indoor radon concentration comes from building materials. The relatively high radium content in building materials used in Hong Kong explains the high indoor radon concentrations measured. Using risk analysis and established data, radon induced lung cancer deaths have been estimated and remedial measures have been recommended. The variations with age of building and type of ventilation are stated to be additional controlling factors. The possible effects of radon solubility in water are also explored.