They said the lung cancer risk from radon in homes is small compared to that from tobacco products. Of about 160,000 annual lung cancer deaths, radon-related deaths were estimated to probably total 15,400 to 21,800, mostly because of a synergism between smoking and radon. The test is cheap, and, often, simple ventilation can turn high radon levels into low ones. Carbon monoxide from space heaters and other home heating sources can be deadly. For that, you need a carbon monoxide alarm.
House plants are cheery, and there's some evidence they clean pollutants from the air.
While occasional loud noises may just reduce your hearing temporarily, continuous exposures or very loud noises can cause permanent damage. If you can't remove the noise, wear protective gear or ear plugs. Loud motorcycles, firecrackers and small arms fire, if close enough, can damage hearing, immediately or over time. Exercise is a way to keep fit, but when you run or skirmish in hot weather, try to do it in the cooler hours. Keep water handy and drink plenty of it.