SmogRank / India / Uttarakhand / Dehradun
Dehradun, month by month
Dehradun has a measured daily mean on 489 days since 19 February 2025. Its worst month was December 2025, at 172 US AQI (85.9 µg/m³), 72nd of 3,006 cities on that month's world ranking. Its cleanest was July 2025, at 54 US AQI (10.9 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
5 months
| Month | Why |
|---|---|
| Oct 2026 | 6 of 12 days measured; a month needs 9. The others: 5 with no readings from the monitor, 1 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. |
| Jul 2026 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jan 2026 | 20 of 31 days measured; a month needs 22. The others: 11 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.
Dehradun's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| December 2025 | 17285.9 µg/m³ | 72ndof 3,006 | – |
| February 2026 | 16169.2 µg/m³ | 39thof 2,866 | Uttar Pradesh, Haryana and Uttarakhand, India, February 2026 |
| November 2025 | 13649.6 µg/m³ | 175thof 2,715 | – |
| March 2026 | 12645.6 µg/m³ | 108thof 2,971 | North-western India and Pakistan, March 2026 |
| April 2025 | 10838.5 µg/m³ | 97thof 2,951 | Northern India, March and April 2025 |
| May 2026 | 10135.6 µg/m³ | 124thof 2,874 | – |
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.
Dehradun's worst days
| Day | US AQI | Episode |
|---|---|---|
| 31 Dec 2025 | 245170.0 µg/m³ | – |
| 1 Jan 2026 | 215140.0 µg/m³ | – |
| 4 Jan 2026 | 200125.0 µg/m³ | – |
| 29 Dec 2025 | 197121.0 µg/m³ | – |
| 30 Dec 2025 | 197121.0 µg/m³ | – |
| 5 Jan 2026 | 196120.0 µg/m³ | – |
| 17 Dec 2025 | 195118.0 µg/m³ | – |
| 28 Dec 2025 | 193116.0 µg/m³ | – |
| 8 Mar 2026 | 193116.0 µg/m³ | North-western India and Pakistan, March 2026 |
| 16 Dec 2025 | 189109.0 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, Dehradun, India, 19 Feb 2025 – 7 Oct 2026. Monitor data from CPCB via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/in/dehradun/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.
Dehradun now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 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).