SmogRank / India / Bihar / Kishanganj
Kishanganj, month by month
Kishanganj has a measured daily mean on 418 days since 19 February 2025. Its worst month was June 2026, at 143 US AQI (52.6 µg/m³), 40th of 2,497 cities on that month's world ranking. Its cleanest was April 2026, at 84 US AQI (27.0 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
11 months
| Month | Why |
|---|---|
| Oct 2026 | 4 of 12 days measured; a month needs 9. The others: 5 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours). |
| Jan 2026 | 18 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks. |
| Nov 2025 | 18 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Sep 2025 | 13 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Aug 2025 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jul 2025 | 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 2025 | 15 of 30 days measured; a month needs 21. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| May 2025 | 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 | 13 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | 9 of 28 days measured; a month needs 20. The others: 1 with under 18 hours of readings or readings that failed our checks. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Kishanganj's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2026 | 14352.6 µg/m³ | 40thof 2,497 | – |
| May 2026 | 14151.7 µg/m³ | 57thof 2,874 | Northern India, May 2026 |
| February 2026 | 12545.1 µg/m³ | 132ndof 2,866 | – |
| March 2026 | 12043.2 µg/m³ | 124thof 2,971 | India, March 2026 |
| December 2025 | 9331.9 µg/m³ | 284thof 3,006 | – |
| September 2026 | 9231.2 µg/m³ | 113thof 2,997 | – |
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.
Kishanganj's worst days
| Day | US AQI | Episode |
|---|---|---|
| 21 Sept 2025 | 302226.0 µg/m³ | Northern India, September 2025 |
| 17 Apr 2025 | 223148.0 µg/m³ | – |
| 20 Apr 2025 | 221146.0 µg/m³ | – |
| 4 Oct 2025 | 199124.0 µg/m³ | – |
| 13 Aug 2025 | 195118.0 µg/m³ | – |
| 26 May 2026 | 191113.0 µg/m³ | – |
| 8 Nov 2025 | 189109.0 µg/m³ | – |
| 12 Feb 2026 | 189109.0 µg/m³ | – |
| 26 Aug 2025 | 187107.0 µg/m³ | – |
| 24 Sept 2025 | 186105.0 µg/m³ | Northern India, September 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, Kishanganj, India, 19 Feb 2025 – 6 Oct 2026. Monitor data from CPCB via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/in/kishanganj/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.
Kishanganj now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 02:07 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).