Radon detectors for real-time, on-site and remote sensing, detecting, monitoring and measuring of radon levels, and for collecting, logging, recording and reporting radon detection data and information; Recorded software for real-time, on-site and remote sensing, detecting, monitoring and measuring of radon levels, and for collecting, logging, recording and reporting radon detection data and information; Downloadable computer application software for displaying radon level indicators, transmitting notifications and system alerts on radon levels, sharing data collected on radon detection among multiple users and subscribers, and enabling interaction between smart devices concerning radon detection data