SmogRank / Nepal / Bagmati Province / Kathmandu
Kathmandu, month by month
Kathmandu has a measured daily mean on 1,156 days since 1 January 2023. Its worst month was April 2024, at 185 US AQI (104.7 µg/m³), 3rd of 2,520 cities on that month's world ranking. Its cleanest was August 2025, at 45 US AQI (8.1 µg/m³). 2024 averaged 152 US AQI (56.6 µg/m³), against 111 US AQI (39.6 µg/m³) in 2023.
Every month since 2023
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 |
|---|---|
| Jul 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| May 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 2025 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Nov 2023 | 13 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 12 of 31 days measured; a month needs 22. The others: 19 missing from OpenAQ's archive. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Kathmandu's worst months
| Month | US AQI | World rank |
|---|---|---|
| April 2024 | 185104.7 µg/m³ | 3rdof 2,520 |
| February 2025 | 17690.6 µg/m³ | 6thof 2,633 |
| December 2024 | 17590.0 µg/m³ | 11thof 2,616 |
| January 2025 | 17488.8 µg/m³ | 13thof 2,474 |
| April 2023 | 17082.1 µg/m³ | 2ndof 1,622 |
| January 2023 | 16981.7 µg/m³ | 13thof 1,261 |
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.
Kathmandu's worst days
| Day | US AQI |
|---|---|
| 9 Apr 2024 | 244168.5 µg/m³ |
| 15 Apr 2023 | 224149.0 µg/m³ |
| 10 Apr 2024 | 222146.5 µg/m³ |
| 7 Apr 2024 | 219144.0 µg/m³ |
| 28 Apr 2023 | 217141.7 µg/m³ |
| 19 Jan 2024 | 216141.0 µg/m³ |
| 19 Feb 2025 | 215140.0 µg/m³ |
| 24 Dec 2024 | 214139.0 µg/m³ |
| 28 Dec 2024 | 213137.5 µg/m³ |
| 20 Feb 2025 | 211136.0 µg/m³ |
Daily means, the highest since 1 Jan 2023; 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, Kathmandu, Nepal, 1 Jan 2023 – 12 Oct 2026. Monitor data from Department of Environment, Nepal, read from the publisher; sources listed at smogrank.com/sources. smogrank.com/np/kathmandu/history (accessed 12 Oct 2026). Contains readings from Department of Environment, Nepal, no reuse terms published.
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.
Kathmandu now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 23:07 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).