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According to news agency PTI, real-time data feeds of the Central Pollution Control Board (CPCB), including the Sameer app and official website, stopped displaying updated air quality index (AQI) readings for several hours from 1 pm onwards, causing widespread concern.
While individual station readings started appearing again on the CPCB portal around 9 pm, many monitors continued to show incomplete data.
The city’s 24-hour average AQI, usually released at 4 pm, is unavailable after 6:30 pm. According to PTI, officials did not immediately provide any clarification.
Air becomes dangerous due to lack of monitoring
Despite data gaps, independent assessments indicated a decline in pollution levels. According to the Times of India (TOI), an external analysis put the average PM 2.5 concentration between midnight and 9 pm on Monday at 249 micrograms per cubic metre, which is close to the “severe” category.
According to TOI, PM 2.5 levels in initial readings published before the blackout were similar to Sunday’s data, yet AQI values rose more rapidly, matching the ground conditions, where visibility dropped dramatically and a thick haze hung over roads and flyovers.
Delhi’s AQI remains very bad
According to PTI, Delhi’s AQI was recorded at 345 on the morning of Monday, November 10, with no further updates throughout the day, remaining firmly in the “very poor” category.
A day earlier, the AQI had reached 391, the highest this season.
Government air quality forecasts on Monday showed zero contribution from stubble burning, although satellite-based farm fire tracking was not updated since November 8. According to PTI, transport emissions account for about 21.4% of Delhi’s pollution load.