Universiti Teknikal Malaysia Melaka · Campus Air Quality Network
Halo size scales with the reading. Solid markers are physical hardware; outlined markers replay recorded campus data.
Open incidents affecting the campus.
No active advisories.
Readings come from ESP32 nodes carrying MQ-5, MQ-6 and two MQ-7 gas sensors with a DHT11 for temperature and humidity. Each node samples every eight seconds and signs every transmission, so a reading cannot be forged by a third party.
The odour index is a relative severity score from 0 to 100, not a concentration in parts per million. MQ-series sensors output a raw analogue value that varies with temperature, humidity and sensor age, and they are not calibrated against a reference gas. Absolute concentrations would require per-sensor calibration that has not been performed.