Delhi’s AQI Mystery: CPCB Reports 400, IQAir Shows 2,000
Delhi’s air pollution crisis is back in the headlines, but this time with conflicting reports. India’s Central Pollution Control Board (CPCB) claims the AQI is 400 (severe), while global platform IQAir reports staggering 2,000+ in some areas. Why such a massive difference, and whose data is accurate? Let’s break it down.
How AQI Works: The Pollution Scale Explained
The Air Quality Index (AQI) measures pollutants like PM2.5, PM10, NO2, and SO2, converting them into a single number. The scale ranges from 0 (good) to 500 (hazardous). Beyond 400, air quality is “severe,” harmful to all residents, not just vulnerable groups.
CPCB vs. IQAir: Key Differences in Data Collection
1. CPCB’s Official Monitoring
- Uses government-approved stations across Delhi.
- Relies on 24-hour averages, smoothing out sudden spikes.
- Follows Indian regulatory standards for calibration.
2. IQAir’s Real-Time Network
- Aggregates data from low-cost public sensors and official stations.
- Captures hyper-local, minute-by-minute pollution surges.
- Reflects peak readings rather than averages.
Why the Huge Gap? 400 vs. 2,000
- Averaged vs. Instant Data: CPCB’s 24-hour readings dilute short-term spikes (e.g., stubble burning), while IQAir shows real-time extremes.
- Sensor Density: IQAir’s crowdsourced network covers pollution hotspots missed by CPCB’s limited stations.
- Calculation Methods: India’s AQI formula differs slightly from global standards.
Which Data Should Delhiites Trust?
- CPCB: Official but may underrepresent local peaks.
- IQAir: More granular but includes unverified sensors.
The truth? Delhi’s baseline is severe (400+), but some areas face extreme pollution (2,000+).
The Real Issue: Delhi’s Toxic Air Crisis
Regardless of the numbers, Delhi’s air is dangerously polluted due to vehicles, industry, construction, and farm fires. The discrepancy highlights the need for:
- More Government Monitoring Stations – To match private sensor coverage.
- Standardized Global AQI Reporting – For clearer comparisons.
- Public Awareness – Use masks/purifiers when AQI is high, regardless of the source.
Conclusion
CPCB and IQAir aren’t wrong—they measure differently. The takeaway? Delhi’s air is a health emergency. Demand better data, systemic solutions, and cleaner air.
Stay updated on pollution trends—follow reliable sources and protect your health.
