Health Effects: Radon is a known carcinogen and contributes to the development of lung cancer and other health concerns. Radon is the leading cause of lung cancer in non-smokers. (Source: EPA Health Risks of Radon)

As of December 1, 2016, 13 states have laws that require radon testing in schools. These states include: Colorado, Connecticut, Florida, Illinois, Maryland, Minnesota, New Jersey, New York, Ohio, Rhode Island, Tennessee, Virginia, and West Virginia. (Source: The Policy Surveilance Program - State Radon Laws)

As of December 1, 2016, 9 states have laws that require radon testing in day care centers. These states include: Connecticut, Florida, Idaho, Illinois, Iowa, Michigan, New Hampshire, New Jersey, and Rhode Island. (Source: The Policy Surveilance Program - State Radon Laws)

A nationwide survey of radon levels in schools estimates that nearly one in five has at least one schoolroom with a short-term radon level above the action level of 4 pCi/L (picoCuries per liter) - the level at which EPA recommends that schools take action to reduce the level. (Source: National Radon Program Services - Radon in Schools)

Radon can be measured using a radon test kit. There are passive and active detectors, and detectors that can be used over short periods of time (2 days - 3 months) and longer periods of time (3 months - 1 year). 

Short term devices, like charcoal test kits, can be used by placing them in a location for at least 48 hours. They can then be sent to a laboratory for testing. 

Radon is often measured in picocurie per Liter, or pCi/L. The average outdoor level is 0.4 pCi/L and the average indoor level is 1.3 pCi/L. (Source: EPA Health Risks of Radon)