SmogRank / Thailand / Chumphon / Chumphon
Chumphon, month by month
Chumphon has a measured daily mean on 480 days since 14 September 2024. Its worst month was January 2026, at 83 US AQI (26.2 µg/m³), 223rd of 2,617 cities on that month's world ranking. Its cleanest was June 2026, at 30 US AQI (5.4 µg/m³).
Every month since 2024
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
10 months
| Month | Why |
|---|---|
| Jul 2026 | 3 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Nov 2025 | 12 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | 9 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| Aug 2025 | 6 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks. |
| Jul 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jan 2025 | 5 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks. |
| Dec 2024 | 1 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Nov 2024 | 3 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | 2 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | 2 of 30 days measured; a month needs 21. The others: 15 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.
Chumphon's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2026 | 8326.2 µg/m³ | 223rdof 2,617 | – |
| February 2025 | 7723.1 µg/m³ | 353rdof 2,633 | Thailand, 12 to 13 February 2025 |
| December 2025 | 7722.8 µg/m³ | 410thof 3,006 | Thailand and Laos, November and December 2025 |
| March 2025 | 7421.3 µg/m³ | 513thof 2,862 | Thailand and Laos, March 2025 |
| February 2026 | 6918.5 µg/m³ | 618thof 2,866 | – |
| April 2026 | 6918.5 µg/m³ | 433rdof 2,941 | – |
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.
Chumphon's worst days
| Day | US AQI | Episode |
|---|---|---|
| 19 Jan 2025 | 13449.1 µg/m³ | – |
| 31 Jan 2025 | 12244.1 µg/m³ | – |
| 14 Jan 2026 | 12043.1 µg/m³ | – |
| 2 Feb 2025 | 11942.9 µg/m³ | – |
| 1 Dec 2025 | 11942.7 µg/m³ | Thailand and Laos, November and December 2025 |
| 6 Mar 2026 | 11942.7 µg/m³ | – |
| 24 Jan 2025 | 11842.4 µg/m³ | – |
| 13 Jan 2026 | 11842.3 µg/m³ | – |
| 1 Feb 2025 | 11641.5 µg/m³ | – |
| 25 Jan 2025 | 11641.4 µg/m³ | – |
Daily means, the highest since 14 Sept 2024; 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, Chumphon, Thailand, 14 Sep 2024 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/chumphon/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.
Chumphon now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 17:07 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).