SmogRank / India / Assam / Guwahati
Guwahati, month by month
Guwahati has a measured daily mean on 549 days since 19 February 2025. Its worst month was February 2026, at 179 US AQI (96.1 µg/m³), 19th of 2,866 cities on that month's world ranking. Its cleanest was August 2025, at 57 US AQI (12.5 µg/m³).
Every month since 2025
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
3 months
| Month | Why |
|---|---|
| Oct 2026 | 6 of 12 days measured; a month needs 9. The others: 5 with no readings from the monitors, 1 with readings for part of the day (a day needs 18 hours). |
| Jan 2026 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | 10 of 28 days measured; a month needs 20. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Guwahati's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2026 | 17996.1 µg/m³ | 19thof 2,866 | – |
| March 2025 | 17285.2 µg/m³ | 12thof 2,862 | Northern India, March and April 2025 North-eastern India, March 2025 |
| April 2025 | 13850.5 µg/m³ | 39thof 2,951 | Northern India, March and April 2025 |
| December 2025 | 13147.7 µg/m³ | 218thof 3,006 | – |
| November 2025 | 11039.3 µg/m³ | 216thof 2,715 | – |
| March 2026 | 10336.3 µg/m³ | 179thof 2,971 | – |
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.
Guwahati's worst days
| Day | US AQI | Episode |
|---|---|---|
| 15 Feb 2026 | 228152.5 µg/m³ | – |
| 14 Feb 2026 | 218142.5 µg/m³ | – |
| 13 Feb 2026 | 216140.5 µg/m³ | – |
| 2 Feb 2026 | 208133.0 µg/m³ | – |
| 1 Feb 2026 | 203127.5 µg/m³ | – |
| 31 Jan 2026 | 202126.5 µg/m³ | – |
| 26 Mar 2025 | 201126.0 µg/m³ | Northern India, March and April 2025 |
| 11 Mar 2025 | 199124.5 µg/m³ | – |
| 25 Mar 2025 | 198123.0 µg/m³ | Northern India, March and April 2025 |
| 23 Mar 2025 | 198122.0 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, Guwahati, India, 19 Feb 2025 – 7 Oct 2026. Monitor data from CPCB via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/in/guwahati/history (accessed 13 Oct 2026).
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.
Guwahati now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 01:07 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).