SmogRank / India / Assam / Dispur

Dispur, month by month

Dispur has a measured daily mean on 369 days since 19 February 2025. Its worst month was May 2026, at 168 US AQI (80.0 µg/m³), 5th of 2,874 cities on that month's world ranking. Its cleanest was September 2026, at 143 US AQI (52.7 µg/m³).

Every month since 2025

2026158 so far213 days measured24th of 2,793 in the world

Jan20 daysFeb18 daysMar162#26 Apr158#32 May168#5 Jun154#25Jul16 daysAug152#9 Sep143#22Oct6 days

2025too few days for a mean (a year needs 256)156 days measured

JanFeb8 daysMar17 daysApr18 daysMay20 daysJun18 daysJul16 daysAug10 daysSep6 daysOct1 dayNov14 daysDec163#99

Each square is a month's mean PM2.5 in US AQI from Dispur's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Dispur marked; each year, the year's.

Good0–50

Moderate51–100

Sensitive groups101–150

Unhealthy151–200

Very unhealthy201–300

Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Months without a mean, and why

14 months

Month	Why
Oct 2026	6 of 12 days measured; a month needs 9. The others: 6 with no readings from the monitor.
Jul 2026	16 of 31 days measured; a month needs 22. The others: 2 with no readings from the monitor, 13 with readings for part of the day (a day needs 18 hours).
Feb 2026	18 of 28 days measured; a month needs 20. The others: 10 with readings for part of the day (a day needs 18 hours).
Jan 2026	20 of 31 days measured; a month needs 22. The others: 9 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours).
Nov 2025	14 of 30 days measured; a month needs 21. The others: 3 with no readings from the monitor, 13 with readings for part of the day (a day needs 18 hours).
Oct 2025	1 of 31 days measured; a month needs 22. The others: 2 with no readings from the monitor, 28 with readings for part of the day (a day needs 18 hours).
Sep 2025	6 of 30 days measured; a month needs 21. The others: 2 with no readings from the monitor, 22 with readings for part of the day (a day needs 18 hours).
Aug 2025	10 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 20 with readings for part of the day (a day needs 18 hours).
Jul 2025	16 of 31 days measured; a month needs 22. The others: 15 with readings for part of the day (a day needs 18 hours).
Jun 2025	18 of 30 days measured; a month needs 21. The others: 1 with no readings from the monitor, 11 with readings for part of the day (a day needs 18 hours).
May 2025	20 of 31 days measured; a month needs 22. The others: 3 with no readings from the monitor, 8 with readings for part of the day (a day needs 18 hours).
Apr 2025	18 of 30 days measured; a month needs 21. The others: 1 with no readings from the monitor, 11 with readings for part of the day (a day needs 18 hours).
Mar 2025	17 of 31 days measured; a month needs 22. The others: 14 with readings for part of the day (a day needs 18 hours).
Feb 2025	8 of 28 days measured; a month needs 20. The others: 2 with readings for part of the day (a day needs 18 hours).

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Dispur's worst months

Month	US AQI	Days measured	World rank
May 2026	16880.0 µg/m³	27 of 31	5thof 2,874
December 2025	16372.7 µg/m³	28 of 31	99thof 3,006
March 2026	16271.7 µg/m³	27 of 31	26thof 2,971
April 2026	15864.8 µg/m³	24 of 30	32ndof 2,941
June 2026	15459.3 µg/m³	27 of 30	25thof 2,497
August 2026	15256.8 µg/m³	22 of 31	9thof 2,896

Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.

Dispur's worst days

Day	US AQI	Episode
19 Mar 2025	481316.0 µg/m³	–
26 Mar 2025	328239.0 µg/m³	Northern India, March and April 2025
8 Apr 2025	284209.0 µg/m³	–
28 Mar 2025	282207.0 µg/m³	Northern India, March and April 2025
1 May 2025	273198.0 µg/m³	–
11 Mar 2025	267192.0 µg/m³	–
20 Mar 2025	264189.0 µg/m³	North-eastern India, March 2025
4 Apr 2025	253178.0 µg/m³	Northern India, March and April 2025
27 Mar 2025	252177.0 µg/m³	Northern India, March and April 2025
2 Apr 2025	239164.0 µg/m³	Northern India, March and April 2025

Daily means, the highest since 19 Feb 2025; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.

Use this history

SmogRank, PM2.5 monthly and daily means, Dispur, India, 19 Feb 2025 – 7 Oct 2026. Monitor data from CPCB via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/in/dispur/history (accessed 12 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Dispur now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).