Highest city air quality index, Arunachal Pradesh | India Health Observatory

Highest city air quality index, Arunachal Pradesh

Name: Highest city air quality index, Arunachal Pradesh
Creator: Central Pollution Control Board, Ministry of Environment, Forest and Climate Change
License: https://data.gov.in/government-open-data-license-india

The highest National AQI among the cities in the geography that appear in CPCB's daily AQI bulletin, for the 24 hours ending 16:00 IST.

58AQI

3 October 2026

+7 (+14%) from 51 AQI in 2 October 2026. A move in the worse direction.

Published in: CPCB National Air Quality Index bulletin, 3 October 2026 (252 cities)
Where in the document: AQI bulletin p.9, Index Value column: highest of 1 city row placed in Arunachal Pradesh — Naharlagun, S.No 170 (p.9), Satisfactory
Evidence: Archived file Original URL Method
First seen by the observatory: 3 Oct 2026. Fetched directly from the publisher.

Arunachal PradeshIndia

200

400

600

Where Arunachal Pradesh stands

3 October 2026. 30 reporting

All reporting states for 3 October 2026, highest first.

050100150200250

India

228

Haryana

228

Uttar Pradesh

Signals

All signals

What the observatory's code found notable in this series.

HighDeteriorating

3 October 2026RecordArunachal Pradesh

Arunachal Pradesh: highest city air quality index of 58 on 3 October 2026 is the highest since 30 May 2026.

CPCB air quality Original document Method Data

History

Download CSV

Every value, newest first. Each figure opens the release it was read from.

Period	Arunachal Pradesh	India	Status	Where in the document
3 October 2026	58	228	Reported	AQI bulletin p.9, Index Value column: highest of 1 city row placed in Arunachal Pradesh — Naharlagun, S.No 170 (p.9), Satisfactory
2 October 2026	51	231	Reported	AQI bulletin p.9, Index Value column: highest of 1 city row placed in Arunachal Pradesh — Naharlagun, S.No 171 (p.9), Satisfactory
1 October 2026	46	324	Reported	AQI bulletin p.9, Index Value column: highest of 1 city row placed in Arunachal Pradesh — Naharlagun, S.No 169 (p.9), Good
29 September 2026	52	227	Reported	AQI bulletin p.9, Index Value column: highest of 1 city row placed in Arunachal Pradesh — Naharlagun, S.No 172 (p.9), Satisfactory
28 September 2026	53

Definition and method

The highest National AQI among the cities in the geography that appear in CPCB's daily AQI bulletin, for the 24 hours ending 16:00 IST.

Methodology

Source: CPCB's daily National Air Quality Index bulletin, published about 16:05 IST for the 24 hours ending 16:00 IST. Each city row's Index Value is CPCB's National AQI (0–500): for every participating continuous monitoring station CPCB computes a sub-index for each pollutant measured (PM2.5, PM10, NO2, SO2, CO, O3, NH3, Pb; at least three, one of them PM2.5 or PM10), takes the highest sub-index as the station AQI, and reports the arithmetic mean of the city's station AQIs. CPCB itself notes that averaging across locations 'is not a scientifically sound approach' and is done for simplicity. IHO takes the largest Index Value among the geography's city rows; the locator names the city (or cities, when tied). The value is copied from the bulletin, not computed.

Caveats

The maximum depends on how many cities report: a state with more monitored cities is more likely to show a high maximum. CPCB caps the index at 500, so the most polluted days are flattened at 500. Coverage is urban and uneven: only cities with continuous monitoring stations appear, the network is concentrated in the Indo-Gangetic plain, Maharashtra, Rajasthan, Karnataka and Haryana, and several states and union territories have one city or none on a given day. Cities with insufficient data drop out of a day's bulletin and come back, so the set of cities behind a state's figure changes from day to day. The network grew from about 10 cities in May 2015 to about 100 in 2020 and about 250–270 in 2024–26, so long-run comparisons, especially for India as a whole, partly reflect which cities were added (many smaller towns from 2021 onward) rather than a change in the air. A city's Index Value is the 24-hour average to 16:00 IST over whichever of its stations reported that day; some bulletins mark stations whose data ended at 15:00.

Comparability

Comparable day to day within a geography; across geographies and years it is affected by the number of cities monitored. The city behind the maximum can change from day to day.

How signals are computed from this series: methodology.

Unit: AQI
Direction: Lower is better
Cadence: Daily
Publisher: Central Pollution Control Board, Ministry of Environment, Forest and Climate Change.

Revisions

Government figures are revised. Earlier values are kept, never silently overwritten.

No value in this series has been revised since the observatory first archived it.

Source releases

The government publications this series was read from.

CPCB National Air Quality Index bulletin, 15 November 2023 (248 cities)PublishedSeen 3 Oct 2026File
CPCB National Air Quality Index bulletin, 28 March 2021 (132 cities)PublishedSeen 3 Oct 2026File
CPCB National Air Quality Index bulletin, 27 March 2021 (132 cities)PublishedSeen 3 Oct 2026File
CPCB National Air Quality Index bulletin, 29 March 2021 (129 cities)PublishedSeen 3 Oct 2026File
CPCB National Air Quality Index bulletin, 30 March 2021 (133 cities)PublishedSeen 3 Oct 2026File
CPCB National Air Quality Index bulletin, 31 March 2021 (130 cities)PublishedSeen 3 Oct 2026

Cite this

India Health Observatory (2026). Highest city air quality index, Arunachal Pradesh, 27 March 2021 to 3 October 2026 [dataset]. Original data: Central Pollution Control Board, Ministry of Environment, Forest and Climate Change, CPCB air quality. https://indiahealthobservatory.com/india/arunachal-pradesh/worst-city-aqi

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