SmogRank / Thailand / Sakon Nakhon / Sakon Nakhon

Sakon Nakhon, month by month

Sakon Nakhon has a measured daily mean on 747 days since 1 January 2023. Its worst month was April 2024, at 125 US AQI (45.2 µg/m³), 36th of 2,520 cities on that month's world ranking. Its cleanest was September 2025, at 36 US AQI (6.5 µg/m³).

Every month since 2023

202668 so far252 days measured409th of 2,798 in the world
Jan74#363Feb68#634Mar82#415Apr119#103May60#475Jun53#616Jul3 daysAug49#1,219Sep44#1,022Oct57#453
2025too few days for a mean (a year needs 256)216 days measured
Jan5 daysFeb71#599Mar104#197Apr86#193May21 daysJun52#1,450JulnoneAug6 daysSep36#1,887Oct10 daysNov12 daysDec62#724
2024too few days for a mean (a year needs 257)193 days measured
Jan59#574Feb89#108Mar19 daysApr125#36May73#138Jun52#700Jul18 daysAug19 daysSep5 daysOct2 daysNov3 daysDec1 day
2023too few days for a mean (a year needs 256)86 days measured
Jan75#126Feb2 daysMar9 daysApr19 daysMay14 daysJun10 daysJul4 daysAug2 daysSep3 daysOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Sakon Nakhon's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Sakon Nakhon marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Unhealthy for sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

25 months
MonthWhy
Jul 20263 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks.
Nov 202512 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks.
Oct 202510 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Aug 20256 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Jul 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
May 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Jan 20255 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Dec 20241 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Nov 20243 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
Oct 20242 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Sep 20245 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks.
Aug 202419 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Jul 202418 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Mar 202419 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks.
Dec 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2023No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 20233 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
Aug 20232 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Jul 20234 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 26 with under 18 hours of readings or readings that failed our checks.
Jun 202310 of 30 days measured; a month needs 21. The others: 20 with under 18 hours of readings or readings that failed our checks.
May 202314 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Apr 202319 of 30 days measured; a month needs 21. The others: 2 missing from OpenAQ's archive, 9 with under 18 hours of readings or readings that failed our checks.
Mar 20239 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 20232 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.

Sakon Nakhon's worst months

MonthUS AQIDays measuredWorld rankEpisode
April 2024 12545.2 µg/m³25 of 3036thof 2,520Thailand and Laos, April and May 2024
April 2026 11943.0 µg/m³30 of 30103rdof 2,941Northern Thailand and Laos, April 2026
March 2025 10436.9 µg/m³27 of 31197thof 2,862Thailand and Laos, March 2025
February 2024 8929.6 µg/m³21 of 29108thof 2,486Thailand, February 2024
Northern Thailand, February 2024
April 2025 8628.0 µg/m³23 of 30193rdof 2,951–
March 2026 8225.5 µg/m³31 of 31415thof 2,971–

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.

Sakon Nakhon's worst days

DayUS AQIEpisode
26 Mar 2025 17792.4 µg/m³Thailand and Laos, March 2025
27 Mar 2025 16778.5 µg/m³Thailand and Laos, March 2025
13 Apr 2026 16778.1 µg/m³Northern Thailand and Laos, April 2026
12 Apr 2026 16474.6 µg/m³Northern Thailand and Laos, April 2026
7 Mar 2024 16271.8 µg/m³Northern Thailand and Laos, March 2024
28 Mar 2025 16170.4 µg/m³Thailand and Laos, March 2025
9 Apr 2026 16169.6 µg/m³–
14 Apr 2026 16068.6 µg/m³Northern Thailand and Laos, April 2026
25 Mar 2025 16068.0 µg/m³Thailand and Laos, March 2025
15 Apr 2026 15966.3 µg/m³Northern Thailand and Laos, April 2026

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, Sakon Nakhon, Thailand, 1 Jan 2023 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/sakon-nakhon/history (accessed 13 Oct 2026).

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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.

Sakon Nakhon now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-13 04:07 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).