SmogRank / Thailand / Bangkok / Saphan Sung

Saphan Sung, month by month

Saphan Sung has a measured daily mean on 846 days since 1 January 2023. Its worst month was January 2024, at 121 US AQI (43.7 µg/m³), 52nd of 2,385 cities on that month's world ranking. Its cleanest was August 2026, at 58 US AQI (12.8 µg/m³).

Every month since 2023

202676 so far242 days measured310th of 2,798 in the world
Jan109#95Feb91#246Mar84#361Apr82#296May67#343Jun61#373Jul3 daysAug58#500Sep62#377Oct6 days
2025too few days for a mean (a year needs 256)241 days measured
Jan121#49Feb109#113Mar20 daysApr75#283May66#333Jun65#326JulnoneAug6 daysSep64#314Oct10 daysNov12 daysDec88#325
202478 for the year281 days measured81st of 2,097 in the world
Jan121#52Feb92#97Mar20 daysApr5 daysMay17 daysJun63#197Jul62#187Aug62#175Sep18 daysOct72#108Nov82#98Dec95#76
2023too few days for a mean (a year needs 256)82 days measured
Jan102#40Feb2 daysMar8 daysApr18 daysMay15 daysJun7 daysJul6 daysAug3 daysSep1 dayOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Saphan Sung'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 Saphan Sung marked; each year, the year's.
Good0–50
Moderate51–100
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

22 months
MonthWhy
Oct 20266 of 12 days measured; a month needs 9. The others: 4 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours), 1 with under 18 hours of readings or readings that failed our checks.
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.
Mar 202520 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks.
Sep 202418 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
May 202417 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Apr 20245 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks.
Mar 202420 of 31 days measured; a month needs 22. The others: 11 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 20231 of 30 days measured; a month needs 21. The others: 29 with under 18 hours of readings or readings that failed our checks.
Aug 20233 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jul 20236 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 24 with under 18 hours of readings or readings that failed our checks.
Jun 20237 of 30 days measured; a month needs 21. The others: 23 with under 18 hours of readings or readings that failed our checks.
May 202315 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Apr 202318 of 30 days measured; a month needs 21. The others: 3 missing from OpenAQ's archive, 9 with under 18 hours of readings or readings that failed our checks.
Mar 20238 of 31 days measured; a month needs 22. The others: 19 missing from OpenAQ's archive, 4 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.

Saphan Sung's worst months

MonthUS AQIDays measuredWorld rankEpisode
January 2024 12143.7 µg/m³25 of 3152ndof 2,385–
January 2025 12143.6 µg/m³27 of 3149thof 2,474–
February 2025 10938.9 µg/m³28 of 28113thof 2,633Thailand, 12 to 13 February 2025
January 2026 10938.7 µg/m³31 of 3195thof 2,617–
January 2023 10235.9 µg/m³22 of 3140thof 1,261Northern Thailand and Laos, January and February 2023
December 2024 9532.5 µg/m³30 of 3176thof 2,616–

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.

Saphan Sung's worst days

DayUS AQIEpisode
1 Feb 2023 16778.3 µg/m³Northern Thailand and Laos, January and February 2023
14 Feb 2024 16271.3 µg/m³Thailand, February 2024
23 Jan 2025 16271.3 µg/m³–
13 Feb 2025 15967.2 µg/m³Thailand, 12 to 13 February 2025
28 Jan 2026 15865.0 µg/m³–
22 Jan 2025 15764.7 µg/m³–
8 Jan 2025 15561.3 µg/m³–
12 Feb 2025 15560.6 µg/m³Thailand, 12 to 13 February 2025
13 Feb 2024 15460.2 µg/m³Thailand, February 2024
9 Jan 2025 15459.4 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, Saphan Sung, Thailand, 1 Jan 2023 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/saphan-sung/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.

Saphan Sung 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).