Delhi's air quality on Diwali this year was the worst for the festival in five years, with the city's average Air Quality Index touching 376 on November 8, 2026. That is the highest Diwali-day reading since 2021, according to CPCB data reported by PTI.

But a widely shared claim that parts of Delhi recorded AQI readings above 3,000 does not match the official record. The actual numbers are bad enough on their own: a citywide average in the 'very poor' band, and at least 11 monitoring stations crossing into 'severe' territory. That gap between what was reported and what circulated matters, because it shapes how seriously people take real, documented health risk versus an exaggerated one.

What the Delhi AQI data actually shows

The Central Pollution Control Board classified Delhi's 24-hour average AQI of 376 on November 8 as 'very poor,' a notch below where it stood the previous day at 369, according to Down To Earth. Under CPCB's scale, anything from 301 to 400 counts as very poor, and 401 to 500 is severe.

At 8 am on Diwali morning, Delhi's overall AQI stood at 383, with several individual stations already past 400, per Business Standard. A CPCB update two hours earlier had put the citywide figure at 384, with Punjabi Bagh at 450, R K Puram at 449 and IIT Delhi at 446, according to IANS. By 10 pm, the city's instantaneous AQI had eased slightly to 371, per PTI.

None of these figures come close to 3,000. The highest individual readings reported anywhere in the data were around 450, which is firmly in the severe band but nowhere near the number being claimed.

Where the 3,000 figure appears to come from

Part of the confusion traces to how different outlets labelled their numbers. The Indian Express reported that Jahangirpuri logged the highest PM2.5 reading at 450 micrograms per cubic metre, followed by Punjabi Bagh at 449, R K Puram at 448, Bawana at 446 and IIT Delhi at 445, according to the Express. These are pollutant concentration readings, not AQI values, and the two scales are not interchangeable. Confusing one for the other is likely how an inflated figure like 3,000 could get attached to Delhi's pollution story this year, but the available CPCB records do not support it at any station.

Delhi's average PM2.5 concentration on Diwali was 257 micrograms per cubic metre, more than four times India's 24-hour national standard of 60, per PTI. That alone is a serious public health number, regardless of any inflated AQI claim circulating alongside it.

Five years of Diwali air in Delhi

The city's Diwali-day AQI has swung widely over the past five years: 382 in 2021, 312 in 2022, 218 in 2023, 328 in 2024, 345 in 2025, and now 376 in 2026, according to Mathrubhumi English. This year's reading is the highest since 2021, when restrictions on firecrackers were looser and enforcement was thinner on the ground.

That trend line matters because it undercuts any narrative of steady improvement. Delhi had posted its best Diwali air quality in 2023 at 218, only to see it worsen in each of the following three years.

A ban that exists on paper

The Supreme Court's restrictions on firecracker use were technically in force through Diwali night, but PTI's report described the episode as exposing clear enforcement failures on the ground. Crackers were burst widely across the city despite the order, and the Air Quality Early Warning System had forecast that conditions could stay severe through November 9, per the Express.

TUI has previously reported on Delhi's attempts to engineer its way out of the smog problem, including cloud-seeding trials tried around the same period, with mixed results on actually clearing the air.

For now, the numbers that matter are the ones CPCB actually recorded: an average AQI of 376, a PM2.5 level four times the national limit, and a cluster of stations in the severe zone. The claim of readings above 3,000 isn't one of them, but the real figures were bad enough to make this Delhi's most polluted Diwali since 2021.