SmogRank / Thailand / Phetchabun / Phetchabun

Phetchabun, month by month

Phetchabun has a measured daily mean on 760 days since 1 January 2023. Its worst month was April 2026, at 128 US AQI (46.6 µg/m³), 89th of 2,941 cities on that month's world ranking. Its cleanest was September 2026, at 43 US AQI (7.7 µg/m³).

Every month since 2023

202673 so far255 days measured339th of 2,791 in the world
Jan90#178Feb88#268Mar87#317Apr128#89May56#580Jun56#506Jul3 daysAug52#1,034Sep43#1,079Oct54#542
2025too few days for a mean (a year needs 256)223 days measured
Jan5 daysFeb104#134Mar120#126Apr78#252May47#1,227Jun52#1,357JulnoneAug6 daysSep47#1,048Oct10 daysNov12 daysDec78#390
2024too few days for a mean (a year needs 257)192 days measured
Jan21 daysFeb128#40Mar19 daysApr127#33May76#114Jun55#435Jul17 daysAug17 daysSep5 daysOct2 daysNov2 daysDecnone
2023too few days for a mean (a year needs 256)90 days measured
Jan92#62Feb2 daysMar9 daysApr18 daysMay15 daysJun13 daysJul5 daysAug2 daysSep3 daysOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Phetchabun'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 Phetchabun 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 20242 of 30 days measured; a month needs 21. The others: 28 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 202417 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Jul 202417 of 31 days measured; a month needs 22. The others: 14 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.
Jan 202421 of 31 days measured; a month needs 22. The others: 10 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 20235 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 25 with under 18 hours of readings or readings that failed our checks.
Jun 202313 of 30 days measured; a month needs 21. The others: 17 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.

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

Phetchabun's worst months

MonthUS AQIDays measuredWorld rankEpisode
April 2026 12846.6 µg/m³30 of 3089thof 2,941–
February 2024 12846.3 µg/m³22 of 2940thof 2,486Thailand, February 2024
Northern Thailand and Laos, February 2024
April 2024 12746.1 µg/m³28 of 3033rdof 2,520Thailand and Laos, April and May 2024
March 2025 12043.4 µg/m³27 of 31126thof 2,862Thailand and Laos, March 2025
February 2025 10436.6 µg/m³28 of 28134thof 2,633–
January 2023 9230.9 µg/m³23 of 3162ndof 1,261–

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.

Phetchabun's worst days

DayUS AQIEpisode
24 Mar 2025 17081.9 µg/m³Thailand and Laos, March 2025
25 Mar 2025 16879.5 µg/m³Thailand and Laos, March 2025
16 Apr 2023 16474.5 µg/m³–
23 Mar 2025 16271.6 µg/m³Thailand and Laos, March 2025
3 Apr 2024 16271.0 µg/m³–
17 Feb 2024 16270.5 µg/m³Thailand, February 2024
16 Feb 2024 16169.9 µg/m³Thailand, February 2024
26 Mar 2025 16169.6 µg/m³Thailand and Laos, March 2025
21 Apr 2023 16169.5 µg/m³–
20 Apr 2023 16169.3 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, Phetchabun, Thailand, 1 Jan 2023 – 12 Oct 2026. Monitor data from Air4Thai via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/th/phetchabun/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.

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

Updated 2026-10-12 19:07 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).