SmogRank / India / Assam / Nagaon
Nagaon, month by month
Nagaon has a measured daily mean on 459 days since 19 February 2025. Its worst month was December 2025, at 156 US AQI (62.0 µg/m³), 138th of 3,006 cities on that month's world ranking. Its cleanest was November 2025, at 74 US AQI (21.3 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
7 months
| Month | Why |
|---|---|
| Oct 2026 | 5 of 12 days measured; a month needs 9. The others: 5 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours). |
| Aug 2026 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Jun 2026 | 20 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Feb 2026 | 17 of 28 days measured; a month needs 20. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jan 2026 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Apr 2025 | 14 of 30 days measured; a month needs 21. The others: 16 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.
Nagaon's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| December 2025 | 15662.0 µg/m³ | 138thof 3,006 | – |
| March 2025 | 13448.7 µg/m³ | 90thof 2,862 | Northern India, March and April 2025 |
| May 2025 | 11942.8 µg/m³ | 63rdof 2,826 | – |
| March 2026 | 11842.4 µg/m³ | 130thof 2,971 | – |
| June 2025 | 11440.7 µg/m³ | 75thof 2,508 | – |
| July 2025 | 10436.7 µg/m³ | 59thof 2,889 | – |
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.
Nagaon's worst days
| Day | US AQI | Episode |
|---|---|---|
| 1 May 2025 | 202127.0 µg/m³ | – |
| 9 May 2025 | 200125.0 µg/m³ | – |
| 2 May 2025 | 18198.3 µg/m³ | – |
| 30 Dec 2025 | 17590.2 µg/m³ | – |
| 27 Mar 2025 | 17386.9 µg/m³ | Northern India, March and April 2025 |
| 29 Dec 2025 | 17286.1 µg/m³ | – |
| 8 May 2025 | 17285.7 µg/m³ | – |
| 28 Mar 2025 | 17083.0 µg/m³ | Northern India, March and April 2025 |
| 25 Dec 2025 | 16575.5 µg/m³ | – |
| 4 Jan 2026 | 16474.6 µg/m³ | – |
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, Nagaon, India, 19 Feb 2025 – 7 Oct 2026. Monitor data from CPCB via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/in/nagaon/history (accessed 12 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.
Nagaon 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).