रिपोर्ट · 31 October 2026

263 AQI at Jahangirpuri, 24 hours to 4 PM, 31 October 2026, the worst monitor in Delhi today, Poor on CPCB's documented formula, and PM2.5 set that figure. 12.5 lakh people live within 4 km of it.

121.6

TODAY

Delhi's AQI calculated with CPCB's documented formula, the mean of 58 stations.

52.8 lakh

NEAR POOR OR WORSE

Within 4 km of 4 Poor-or-worse monitors: 23.3 per cent of Delhi, every pollutant counted.

4.1x

THE WHO 24-HOUR LINE

Delhi's PM2.5 today, as measured, against the WHO 24-hour guideline.

यहाँ के एक्यूआई आँकड़े उसी फ़ॉर्मूले से निकाले गए हैं, जो केंद्रीय प्रदूषण नियंत्रण बोर्ड (CPCB) अपने वायु गुणवत्ता सूचकांक के लिए प्रकाशित करता है। यह फ़ॉर्मूला CPCB ने अपने दस्तावेज़ों में दिया है: CPCB का नोट: एक्यूआई कैसे निकाला जाता है; CPCB का एक्यूआई कैलकुलेटर।
यह रिपोर्ट अंग्रेज़ी में है।

पूरी रिपोर्ट

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दिन का सार

Today, 31 October 2026, 24 hours to 4 PM: Delhi's AQI was 121.6, Moderate, 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 34 sets out the formula). As measured, 43 of the 44 monitors reading PM2.5 were above the WHO 24-hour guideline of 15 µg/m³. Above AQI 200 today: 4 stations, Jahangirpuri 263, Punjabi Bagh 230, Rohini 216, Mundka 215. Poor or worse air reached 52.8 lakh people within 4 km of their monitor today, 23.3 per cent of Delhi.

The year so far, 1 January to 30 October: the cleaner days of 2026 have been the dirtiest for these dates since 2019, because three days in four read above 107.3 on the particle AQI, against 93.4 on the same dates of 2025. The middle day reads 155.2 against 143.5 on the same dates last year. On an average day, 27.2 per cent of Delhi's reporting monitors, about 12 of 44, sat above 200 on the particle AQI.

निष्कर्ष

रिपोर्ट क्या कहती है

यह रिपोर्ट अंग्रेज़ी में है।

Against yesterday: the one-day move

From 64 to 122. On the 54 stations that reported on both days, the 95 per cent interval runs 47.5 to 70.4 points.

Against last year: the observed reading

Today 122 across 58 stations. The year is judged on the 39 matched stations: 134 today against 315, the mean of the same date ±7 days of 2025 at those stations. The interval runs -193.4 to -166.9 points.

The worst station in the city today

Poor, set by PM2.5. Its PM2.5 averaged 109.3 µg/m³ over the 24 hours to 4 PM, 7.2 times the WHO 24-hour guideline of 15 µg/m³. Last year this station read 354 on the mean of the same date ±7 days, so the change is -91.1 points. 12.5 lakh people live within 4 km of this monitor. Within 500 m of the monitor, 92% of the land is built up and 7% is under vegetation, so this reading describes a densely built neighbourhood.

The year, from its best days to its worst

On the same 303 complete dates, 1 January to 30 October, the best tenth of days reads 75.7 against 72.4 and the worst tenth 281.3 against 311.9. The days at or below 200 went from 211 to 218.

How much of the city was above AQI 200

That is 11.7 of 44.1 reporting stations, against 28.8 per cent over the same dates last year, a change of -1.6 points on an interval of -8.5 to +4.7, so it is unchanged inside its margin.

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 23.3 per cent of Delhi, living around the 4 monitors that read Poor or worse. Jahangirpuri was worst at 263, and 12.5 lakh people live within 4 km of it. This counts people near the monitors, not measured individual exposure.

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