History of the local radiation. Monitoring device: OpenGeiger GM-01A (https://code.google.com/p/opengeiger/). Sensor data: SBM-20 geiger tube (gamma sensitivity Co60: ~150 cpm per µSv/h). Inspired by user lbergeret.
The official AQILITY MkII system for broadcasting accurate (±20%) AQI indices, by using formulae from the EPA and MATLAB analysis. The AQILITY is an independently developed air quality system with off-the-shelf components, and stationed in SST.