The challenge
Two reference-grade monitoring stations could tell the city its average air quality but nothing about which junctions, industrial pockets or construction sites were actually driving it.
What we did
Sixty low-cost sensor nodes deployed across wards, each co-located periodically with a reference station for drift correction — the step most low-cost networks skip and the reason most of them produce unusable data. Calibrated readings feed a public dashboard and a source-attribution model that ranks contributing zones.