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Common Ground For Health Risk Reduction
Airborne particulates impact all three areas.
Improvements in air quality can benefit radon
Indoor
Radon
Outdoor Air
Quality
Indoor
Air Quality
Airborne particulates can cause stress on the respiratory system, especially for those with asthma and lung disease.  That is why there has been such an emphasis on reducing airborne particulates in the outdoor and indoor environment.
These programs have been successful in significantly reducing particulates by the use of scrubbers on industrial exhausts, controlled burning programs and also by having cleaner combustion appliances and discouraging indoor smoking at home and the workplace.
In addition to improving the air we breathe there is a very significant benefit that can be gained from these air quality programs with respect to the health effects of radon.
By reducing airborne particulate levels radon decay product exposures are also reduced.  Conversely, in areas where particulate levels are not being controlled, the risk of radon can be heightened.
In other words, there is an overlap of air quality and radon programs that exists, where improvements in air quality can beneficially reduce radon risks.