Abstract: A system to assess and prove the efficacy of one or more indoor air purification devices. Sensors to detect direct stimulus as to particulate and gas impurities, and collect and send the data collected from those sensors via a network to a computing device to analyze the sensor data and prove whether or not the purification devices are operating correctly. The system may also collect and analyze indirect stimulus data such as current, light intensity, temperature, humidity and air flow to prove or disprove efficacy of the purification device(s).