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Delhi Air Quality Index Surges Over 1,000 While Other Stations Show Below 500 – Data Discrepancies Explained
✍️ NDTV Top
🗓 09 Nov 2026, 11:38 AM
👁 5
Real‑time monitoring by CPCB’s Sameer app and ground stations revealed that while some Delhi locations recorded AQI values exceeding 1,000, others reported levels below 500, raising questions about data consistency.
The Central Pollution Control Board (CPCB) released real‑time air quality data from its Sameer mobile application and several ground‑based monitoring stations across Delhi today. While a handful of sensors recorded AQI values above 1,000, indicating extreme toxicity, other stations in the same city reported AQI levels below 500, a figure still considered unhealthy for sensitive groups.
The discrepancy has sparked confusion among residents and officials alike. Experts point out that the Sameer app aggregates data from a mix of calibrated and non‑calibrated sensors, some of which are positioned in highly polluted industrial zones, whereas other stations are located in comparatively cleaner residential areas.
CPCB spokespersons explained that variations can arise from differences in sensor technology, maintenance schedules, and the immediate micro‑environment around each station. They urged the public to consult multiple sources and to follow health advisories issued by local authorities.
The government has announced a review of the monitoring network and plans to standardize sensor calibration protocols to ensure more reliable readings in the future.
The discrepancy has sparked confusion among residents and officials alike. Experts point out that the Sameer app aggregates data from a mix of calibrated and non‑calibrated sensors, some of which are positioned in highly polluted industrial zones, whereas other stations are located in comparatively cleaner residential areas.
CPCB spokespersons explained that variations can arise from differences in sensor technology, maintenance schedules, and the immediate micro‑environment around each station. They urged the public to consult multiple sources and to follow health advisories issued by local authorities.
The government has announced a review of the monitoring network and plans to standardize sensor calibration protocols to ensure more reliable readings in the future.