Radon Detection Specialists has been providing the highest quality radon surveys in Illinois since 1986. We developed this app for real estate professionals who would like to be able to provide their clients with information regarding local radon levels. This app provides two sets of radon testing data for Illinois residences, our in-house data comprising over 20,000 tests and the available data collected by the state of Illinois Radon Program. The data is searchable by zip code and returns the sample size, the percent of homes that tested at or above the EPA Action Level, and the highest level found for that zip code. Both sets of data are updated regularly.