SmogRank / Thailand / Samut Sakhon / Samut Sakhon
Samut Sakhon, month by month
Samut Sakhon has a measured daily mean on 1,007 days since 1 January 2023. Its worst month was January 2024, at 149 US AQI (54.9 µg/m³), 26th of 2,385 cities on that month's world ranking. Its cleanest was September 2025, at 56 US AQI (11.9 µg/m³). 2024 averaged 79 US AQI (23.9 µg/m³), against 85 US AQI (27.3 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
13 months
| Month | Why |
|---|---|
| Jul 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jun 2026 | 18 of 30 days measured; a month needs 21. The others: 12 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 | 10 of 31 days measured; a month needs 22. The others: 21 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. |
| May 2025 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Jan 2025 | 4 of 31 days measured; a month needs 22. The others: 27 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 | 2 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | 20 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 9 of 31 days measured; a month needs 22. The others: 19 missing from OpenAQ's archive, 3 with under 18 hours of readings or readings that failed our checks. |
| Feb 2023 | 2 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 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.
Samut Sakhon's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2024 | 14954.9 µg/m³ | 26thof 2,385 | – |
| December 2023 | 14051.3 µg/m³ | 26thof 2,247 | – |
| December 2025 | 13147.6 µg/m³ | 220thof 3,006 | – |
| January 2026 | 13047.2 µg/m³ | 53rdof 2,617 | – |
| November 2023 | 12143.6 µg/m³ | 16thof 2,243 | – |
| January 2023 | 10637.6 µg/m³ | 34thof 1,261 | Northern Thailand and Laos, January and February 2023 |
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.
Samut Sakhon's worst days
| Day | US AQI | Episode |
|---|---|---|
| 24 Jan 2025 | 184102.0 µg/m³ | Northern Thailand, January 2025 |
| 14 Feb 2024 | 17995.0 µg/m³ | Thailand, February 2024 |
| 12 Feb 2025 | 17487.9 µg/m³ | Thailand, 12 to 13 February 2025 |
| 16 Dec 2023 | 17386.2 µg/m³ | – |
| 19 Jan 2024 | 17184.0 µg/m³ | – |
| 1 Feb 2023 | 17083.1 µg/m³ | Northern Thailand and Laos, January and February 2023 |
| 23 Mar 2025 | 17082.3 µg/m³ | Thailand and Laos, March 2025 |
| 13 Feb 2024 | 16980.8 µg/m³ | Thailand, February 2024 |
| 14 Jan 2026 | 16980.7 µg/m³ | – |
| 30 Nov 2023 | 16879.9 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, Samut Sakhon, Thailand, 1 Jan 2023 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/samut-sakhon/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.
Samut Sakhon now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 00:07 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).