City air-quality sensor grid
240 co-located-calibrated PM2.5 nodes feeding a public dashboard and traffic-policy analytics.
AhmedabadSmart city2024
- 240
- nodes
- ±3 µg/m³
- calibrated error
- 1 min
- data cadence
The challenge
Low-cost sensors drift and were distrusted by the city's scientists.
What we built
Reference-station co-location, ML calibration per node and an open data API with documented uncertainty.
Highlights
- Uncertainty published next to every reading
- Solar-powered with 30-day autonomy
- Open API for researchers
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