https://www.youtube.com/watch?v=T60X_vwkoKw Environmental Protection Agency officials confirmed 99 of 135 beta-radiation sensors in its RadNet system—which monitors in all 50 states, the District of Columbia and Puerto Rico—aren’t working and have been turned off. Officials blame electromagnetic interference from sources such as cellphone towers and said efforts to resolve the problem have been unsuccessful

Source: Radiation Sensors in Major U.S. Cities Turned Off By EPA