SmogRank / Thailand / Sing Buri / Sing Buri

Sing Buri, month by month

Sing Buri has a measured daily mean on 746 days since 29 January 2023. Its worst month was January 2024, at 123 US AQI (44.6 µg/m³), 47th of 2,385 cities on that month's world ranking. Its cleanest was June 2026, at 50 US AQI (9.0 µg/m³).

Every month since 2023

202680 so far252 days measured266th of 2,791 in the world
Jan123#66Feb104#178Mar98#195Apr121#101May61#452Jun50#813Jul3 daysAug53#895Sep53#650Oct58#345
2025too few days for a mean (a year needs 256)224 days measured
Jan5 daysFeb119#70Mar115#143Apr94#147May70#289Jun53#1,296JulnoneAug6 daysSep60#369Oct10 daysNov12 daysDec91#306
2024too few days for a mean (a year needs 257)198 days measured
Jan123#47Feb116#56Mar20 daysApr115#48May78#106Jun54#548Jul18 daysAug18 daysSep5 daysOct2 daysNov3 daysDecnone
2023too few days for a mean (a year needs 256)72 days measured
Jan3 daysFeb2 daysMar9 daysApr18 daysMay15 daysJun14 daysJul7 daysAug2 daysSep2 daysOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Sing Buri'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 Sing Buri marked; each year, the year's. A dashed square is the running month, so far.
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

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.
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 2024No day measured. The others: 31 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 202418 of 31 days measured; a month needs 22. The others: 13 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 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 20232 of 30 days measured; a month needs 21. The others: 28 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 20237 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 23 with under 18 hours of readings or readings that failed our checks.
Jun 202314 of 30 days measured; a month needs 21. The others: 16 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: 2 missing from OpenAQ's archive, 10 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.
Jan 20233 of 31 days measured; a month needs 22.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Sing Buri's worst months

MonthUS AQIDays measuredWorld rankEpisode
January 2024 12344.6 µg/m³23 of 3147thof 2,385–
January 2026 12344.4 µg/m³31 of 3166thof 2,617–
April 2026 12143.5 µg/m³30 of 30101stof 2,941–
February 2025 11943.0 µg/m³28 of 2870thof 2,633–
February 2024 11641.4 µg/m³23 of 2956thof 2,486–
March 2025 11541.1 µg/m³28 of 31143rdof 2,862Thailand and Laos, March 2025

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.

Sing Buri's worst days

DayUS AQIEpisode
25 Jan 2025 18198.5 µg/m³Northern Thailand, January 2025
24 Jan 2025 18097.3 µg/m³Northern Thailand, January 2025
16 Apr 2023 17184.3 µg/m³Thailand, April 2023
17 Apr 2023 17083.0 µg/m³Thailand, April 2023
24 Mar 2025 16981.8 µg/m³Thailand and Laos, March 2025
26 Jan 2025 16779.0 µg/m³Northern Thailand, January 2025
16 Feb 2024 16677.4 µg/m³–
1 Feb 2023 16677.0 µg/m³–
2 Feb 2025 16473.8 µg/m³–
7 Apr 2023 16473.7 µg/m³–

Daily means, the highest since 29 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, Sing Buri, Thailand, 29 Jan 2023 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/sing-buri/history (accessed 12 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.

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

Updated 2026-10-12 20:07 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).