Reduce run-off by maintaining ample grass cover and shrubs. Be aware of the dangers of lead to children. Keep kids away from surfaces covered with lead-based paint and renovations of older buildings. Test your drinking water to be sure it does not contain harmful levels of lead or other contaminants. Reduce smoke, radon, asbestos and other indoor-air pollutants.
Many stores sell test kits for measuring radon levels.
A reading above 4 picocuries per liter could indicate a problem. When combined with radon, tobacco smoke further increases one's chance of developing lung cancer. Make your environment a smoke-free environment.