रिपोर्ट · 19 October 2026

211 AQI at R K Puram, 24 hours to 4 PM, 19 October 2026, Poor on CPCB's documented formula, and PM2.5 set that figure. 5.6 lakh people live within 4 km of it.

137.7

TODAY

Delhi's AQI calculated with CPCB's documented formula, the mean of 56 stations.

7.1 lakh

NEAR POOR OR WORSE

Within 4 km of 2 Poor-or-worse monitors: 3.1 per cent of Delhi, every pollutant counted.

4.0x

THE WHO 24-HOUR LINE

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

आज के कार्ड

717,863 people (3.1%) live within 4 km of a station that read Poor or

WHO सीमा पार — PM2.5 56/56, PM10 56/56 (NAAQS 46)

Year to date on 291 matched dates: lower quartile 91 to 107 (unchanged

27% of Delhi's reporting monitors (11.2 of 43.6) read above AQI 200 on

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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।
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दिन का सार

Today, 19 October 2026, 24 hours to 4 PM: Delhi's AQI was 137.7, Moderate, calculated with CPCB's documented formula as the mean of 56 stations' AQIs (CPCB's note "How is AQI calculated?" and its AQI Calculator; page 34 sets out the formula). As measured, 43 of the 43 monitors reading PM2.5 were above the WHO 24-hour guideline of 15 µg/m³. Above AQI 200 today: 2 stations, R K Puram 211, Chhawla 201. The highest reading anywhere in Delhi today was 225 at Pusa (IITM), and ozone set that figure. The figure at the head of this page is lower, because this record does not anchor its headline on Pusa (IITM), whose nitrogen oxide readings fail this record's consistency check; the count below includes every pollutant. Poor or worse air reached 7.1 lakh people within 4 km of their monitor today, 3.1 per cent of Delhi.

The year so far, 1 January to 18 October: the cleaner days of 2026 have been the dirtiest for these dates since 2019, because three days in four read above 106.7 on the particle AQI, against 90.7 on the same dates of 2025. The middle day reads 152.8 against 138.0 on the same dates last year. On an average day, 26.7 per cent of Delhi's reporting monitors, about 11 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 186 to 138. On the 56 stations that reported on both days, the 95 per cent interval runs -60.4 to -37.2 points.

Against last year: the observed reading

Today 138 across 56 stations. The year is judged on the 36 matched stations: 147 today against 287, the mean of the same date ±7 days of 2025 at those stations. The interval runs -157.7 to -123.1 points.

The highest particle reading in the city today

Poor, set by PM2.5. Its PM2.5 averaged 93.2 µg/m³ over the 24 hours to 4 PM, 6.2 times the WHO 24-hour guideline of 15 µg/m³. Last year this station read 292 on the mean of the same date ±7 days, so the change is -80.9 points. 5.6 lakh people live within 4 km of this monitor. The highest reading of the day was 225 at Pusa (IITM), set by ozone. Within 500 m of the monitor, 74% of the land is built up and 26% is under vegetation, so this reading describes a densely built neighbourhood.

The year, from its best days to its worst

On the same 291 complete dates, 1 January to 18 October, the best tenth of days reads 75.3 against 72.0 and the worst tenth 288.0 against 287.2. The days at or below 200 went from 211 to 213.

How much of the city was above AQI 200

That is 11.2 of 43.6 reporting stations, against 26.0 per cent over the same dates last year, a change of +0.7 points on an interval of -4.7 to +6.0, 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; 56 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 3.1 per cent of Delhi, living around the 2 monitors that read Poor or worse. The highest reading this record leads on is R K Puram at 211, and 5.6 lakh people live within 4 km of it; the higher readings it sets aside are named below. This counts people near the monitors, not measured individual exposure.

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