रिपोर्ट · 01 September 2026

216 AQI at Wazirpur, 24 hours to 4 PM, 01 September 2026, the worst monitor in Delhi today, Poor on CPCB's documented formula, and PM10 set that figure. 14.0 lakh people live within 4 km of it.

115

TODAY, AS MEASURED

Measured on CPCB's documented formula; with the weather removed, the model's 42 stations read 82, against 115 measured.

1.72 crore

NEAR MODERATE OR WORSE

Within 4 km of 33 Moderate-or-worse monitors: 82.2 per cent of Delhi, every pollutant counted.

1.9x

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

इस दिन की पूरी लिखित रिपोर्ट, हर आँकड़े और उसके स्रोत के साथ।

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दिन का सार

Today, 01 September 2026, 24 hours to 4 PM: worse than last year on the observed index, +42.7 points; with the weather removed, still 1 points worse on the model's count. 2 of 3 pollutants, PM2.5, PM10, show no real improvement. Delhi's AQI was 115, Moderate, calculated with CPCB's documented formula as the mean of 42 stations' AQIs (CPCB's note "How is AQI calculated?" and its AQI Calculator; page 33 sets out the formula). As measured, 38 of the 42 monitors reading PM2.5 were above the WHO 24-hour guideline of 15 µg/m³. Poor or worse air reached 14.0 lakh people within 4 km of their monitor today, 6.7 per cent of Delhi.

The year so far, 1 January to 1 September: the cleaner days of 2026 have been the dirtiest for these dates since 2019, because three days in four read above 112.0 on the particle AQI, against 91.2 on the same dates of 2025. The middle day reads 157.6 against 147.0 on the same dates last year. On an average day, 30.5 per cent of Delhi's reporting monitors, about 13 of 43, sat above 200 on the particle AQI.

निष्कर्ष

रिपोर्ट क्या कहती है

यह रिपोर्ट अंग्रेज़ी में है।

The verdict, both rulers

On the weather model's own count of 34 matched stations, the observed year reads +46.4 points; with the weather removed it is still +1 points worse, on the model's count across 28 of 34 stations. 2 of 3 pollutants, PM2.5, PM10, show no real improvement. With the weather removed, 28 of the model's 34 matched stations read higher than last year.

Against yesterday: the one-day move

From 119 to 115. On the 41 stations that reported on both days, the 95 per cent interval runs -7.5 to 0.3 points, so the honest reading is level, not better.

Against last year: the observed reading

Today 115 across 42 stations. The year is judged on the 34 matched stations: 119 today against 76, the mean of the same date ±7 days of 2025 at those stations. The interval runs 35.9 to 50.4 points.

The worst station in the city today

Poor, set by PM10. Its PM10 averaged 261.8 µg/m³ over the 24 hours to 4 PM, 5.8 times the WHO 24-hour guideline of 45 µg/m³. Last year this station read 115 on the mean of the same date ±7 days, so the change is +101.1 points. 14.0 lakh people live within 4 km of this monitor. Within 500 m of the monitor, 91% of the land is built up and 8% is under vegetation, so this reading describes a densely built neighbourhood.

The year, from its best days to its worst

On the same 244 complete dates, 1 January to 1 September, the best tenth of days reads 83.3 against 72.1 and the worst tenth 301.7 against 305.2. The days at or below 200 went from 168 to 166.

How much of the city was above AQI 200

That is 12.7 of 43.2 reporting stations, against 28.9 per cent over the same dates last year, a change of +1.6 points on an interval of -4.0 to +7.8, 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 45 per cent, and within 500 m only 3.6 per cent. Delhi has 55 monitors in 53 zones, of which 42 reported today, and 30 of the 53 zones stretch past 4 km, the distance that the US EPA's neighbourhood scale treats as the furthest a monitor speaks for.

What each monitor's reading speaks for

That is 6.7 per cent of Delhi, living around the 1 monitor that read Poor or worse. Wazirpur was worst at 216, and 14.0 lakh people live within 4 km of it. On the wider count, 1.72 crore people, 82.2 per cent of Delhi, live within 4 km of a monitor at Moderate or worse.

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