Delhi AQI today after Diwali: Station-wise readings and what GRAP Stage III means
Delhi's air quality fell into the severe category after Diwali, with CPCB data showing an overall AQI of 483 on November 9, though other readings and city tables show lower and higher figures.
Vivek Vihar: 445. Burari Crossing: 441. Jahangirpuri: 433 to 442.
Rohini: 430 to 438. DTU: 430 to 434. Bawana: 427.
New Tehsil-Loni: 463. Sonia Vihar: 457.
GRAP Stage III: halt to non-essential construction, more vehicle limits and hybrid classes up to primary level.
Overall CPCB AQI on November 9: 483.
Other readings in that report include North Campus at 433, Bawana at 427, Ghazipur at 418, Mundka at 417, Punjabi Bagh at 408 to 409 and Narela at 407.
Daily Jagran lists New Tehsil-Loni in Ghaziabad at 463 and Sonia Vihar in Delhi at 457, and gives Burari Crossing as 441 in one list and 449 in another, so station figures differ within and between reports.
Not every station was in the severe range: Organiser lists CRRI Mathura Road at 396, Dr Karni Singh Shooting Range at 361 and Najafgarh at 340.
The Hans India and Daily Jagran city tables, citing CPCB data for November 9, give Delhi a figure of 370, in the very poor category, which differs from the 483 overall figure.
The Hans India also reports a reading of 776 for Delhi from AQI.in at 6:51 am on Monday, which comes from a private platform and not from the CPCB.
Organiser reports that Swiss-based IQAir recorded readings above 1,000 in Shahdara and Defence Colony, without giving times or exact values, and says the difference reflects variations in methodologies.
The Air Quality Index runs from 0 to 500, with 0 to 50 good, 51 to 100 satisfactory, 101 to 200 moderate, 201 to 300 poor, 301 to 400 very poor and 401 to 500 severe, according to Organiser.
Readings above 500 are shown as 500 or 500 plus on the official scale, which is one reason private platforms can show higher numbers.
The Graded Response Action Plan Stage III was put in place across Delhi-NCR on November 6, according to Organiser, three days before the Diwali period it describes.
Smog over the Indus-Ganga Plain, NOAA satellite image of 2017 (file image), Wikimedia Commons, public domain
Reporting for Hindustan Hunt on news and stories from across India.
