हवा का हिसाब Hawa Ka Hisab
Published by Shri Ajay Maken, Member of Parliament, Rajya Sabha. Independent analysis of official CPCB monitoring data. Data compiled by CREA, with our thanks for its work in creating awareness. CREA has no involvement in this site. Contact: [email protected]

Report · 11 November 2026

445 AQI at Chhawla, 24 hours to 4 PM, 11 November 2026, the worst monitor in Delhi today, Severe on CPCB's documented formula, and PM10 set that figure. 1.5 lakh people live within 4 km of it.

329.4
TODAY
Delhi's AQI calculated with CPCB's documented formula, the mean of 58 stations.
2.06 crore
NEAR POOR OR WORSE
Within 4 km of 57 Poor-or-worse monitors: 91.0 per cent of Delhi, every pollutant counted.
10.4x
THE WHO 24-HOUR LINE
Delhi's PM2.5 today, as measured, against the WHO 24-hour guideline.
The AQI figures here are calculated with the formula that the Central Pollution Control Board (CPCB) publishes for its air quality index. CPCB's own documents set out that formula: CPCB's note on how the AQI is calculated; CPCB's AQI calculator.

The full report

The complete written report for this day, with every figure and the source it comes from.

Download the daily reportPDF, 4.3 MB

The day in brief

Delhi's AQI was 329.4, Very Poor, calculated with CPCB's documented formula as the mean of 58 stations' AQIs (CPCB's note "How is AQI calculated?" and its AQI Calculator; page 29 sets out the formula). As measured, 58 of the 58 monitors reading PM2.5 were above the WHO 24-hour guideline of 15 µg/m³. Above AQI 200 today: 57 stations, Chhawla 445, Chandni Chowk 438, IIT Delhi 434, DTU 428, and 53 more in the station table. Poor or worse air reached 2.06 crore people within 4 km of their monitor today, 91.0 per cent of Delhi.

The year so far, 1 January to 10 November: the cleaner days of 2026 have been the dirtiest for these dates since 2019, because three days in four read above 108.1 on the particle AQI, against 95.2 on the same dates of 2025. The middle day reads 158.0 against 147.0 on the same dates last year. On an average day, 29.5 per cent of Delhi's reporting monitors, about 13 of 45, sat above 200 on the particle AQI.

The findings

What the report says

Against yesterday: the one-day move
From 321 to 328. On the 57 stations that reported on both days, the 95 per cent interval runs -3.2 to 17 points, so the honest reading is level, not worse.
Against last year: the observed reading
Today 329 across 58 stations. The year is judged on the 38 matched stations: 333 today against 383, the mean of the same date ±7 days of 2025 at those stations. The interval runs -66 to -32.3 points.
The worst station in the city today
Severe, set by PM10. Its PM10 averaged 460.3 µg/m³ over the 24 hours to 4 PM, 10.2 times the WHO 24-hour guideline of 45 µg/m³. 1.5 lakh people live within 4 km of this monitor. Within 500 m of the monitor, 5% of the land is built up and 95% is under vegetation, so this reading describes open ground rather than a residential street, and should not be read as typical of where people live.
The year, from its best days to its worst
On the same 314 complete dates, 1 January to 10 November, the best tenth of days reads 78.1 against 72.6 and the worst tenth 303.9 against 321.4. The days at or below 200 went from 211 to 219.
How much of the city was above AQI 200
That is 13.1 of 44.6 reporting stations, against 31.0 per cent over the same dates last year, a change of -1.5 points on an interval of -8.2 to +4.5, so it is unchanged inside its margin. On 2025's own monitors, 2026 reads 31.0 per cent against 31.0 in 2025.
How many station-hours were above AQI 200, and at 500
Against 31.5 per cent over the same dates in 2025. On 2025's own monitors, 2026 reads 32.7 per cent against 31.5, and at AQI 500 2.32 against 2.04. 6,961 station-hours in 2026 stood at AQI 500, 2.08 per cent of all hours measured.
Who the monitoring network reaches
Within 4 km live 92 per cent of Delhi's people, within 2 km 44 per cent, and within 500 m only 3.5 per cent. The map holds 55 monitors in 53 zones; 58 monitors reported today. 33 of the 53 zones stretch past our chosen 4 km proximity threshold, informed by US EPA neighbourhood-scale guidance.
What each monitor's reading speaks for
That is 91.0 per cent of Delhi, living around the 57 monitors that read Poor or worse. Chhawla was worst at 445, and 1.5 lakh people live within 4 km of it. This counts people near the monitors, not measured individual exposure.
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