SmogRank / Thailand / Phayao

Air quality in Phayao

Phayao, Thailand. PM2.5 from 1 reference monitor, updated hourly.

13.6µg/m³
Fair

Latest hour (03:00 UTC), 0.9× the WHO 24-hour guideline.

Rank, worst first

24 hours–not enough data
7 days#842of 2,605, at 9.6 µg/m³
30 days#669of 2,626, at 10.3 µg/m³
This year#255of 2,447, at 33.2 µg/m³

Why it ranks here

Cleaner than usual this week. The last 7 days averaged 9.6 µg/m³, well below its typical 21.0; rain or wind often clears the air for a while.
Seasonal. Over the past year its worst months were April, averaging up to 99.2 µg/m³ against 9.6 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

Based on Phayao's own measurements; causes are the usual kinds for a pattern like this, not a confirmed source.

The last 12 months, day by day

1102031Nov 2025DecJan 2026FebMarAprMayJunJulAugSepOct2025-11-01: no data2025-11-02: no data2025-11-03: no data2025-11-04: no data2025-11-05: no data2025-11-06: no data2025-11-07: no data2025-11-08: no data2025-11-09: no data2025-11-10: no data2025-11-11: no data2025-11-12: no data2025-11-13: no data2025-11-14: no data2025-11-15: no data2025-11-16: no data2025-11-17: no data2025-11-18: no data2025-11-19: 7.0 µg/m³2025-11-20: 7.2 µg/m³2025-11-21: 9.4 µg/m³2025-11-22: 12.6 µg/m³2025-11-23: 15.7 µg/m³2025-11-24: 17.3 µg/m³2025-11-25: 16.8 µg/m³2025-11-26: 23.8 µg/m³2025-11-27: 24.7 µg/m³2025-11-28: 22.9 µg/m³2025-11-29: 25.3 µg/m³2025-11-30: 28.0 µg/m³2025-12-01: 31.9 µg/m³2025-12-02: 31.4 µg/m³2025-12-03: 29.9 µg/m³2025-12-04: 30.3 µg/m³2025-12-05: 25.2 µg/m³2025-12-06: 24.5 µg/m³2025-12-07: 22.5 µg/m³2025-12-08: 23.2 µg/m³2025-12-09: 24.3 µg/m³2025-12-10: 25.4 µg/m³2025-12-11: 25.2 µg/m³2025-12-12: 22.9 µg/m³2025-12-13: 14.7 µg/m³2025-12-14: 13.5 µg/m³2025-12-15: 14.6 µg/m³2025-12-16: 15.2 µg/m³2025-12-17: 16.1 µg/m³2025-12-18: 19.1 µg/m³2025-12-19: 19.0 µg/m³2025-12-20: 19.1 µg/m³2025-12-21: 21.2 µg/m³2025-12-22: 21.9 µg/m³2025-12-23: 21.3 µg/m³2025-12-24: 21.0 µg/m³2025-12-25: 21.0 µg/m³2025-12-26: 21.4 µg/m³2025-12-27: 17.6 µg/m³2025-12-28: 20.1 µg/m³2025-12-29: 22.6 µg/m³2025-12-30: 24.7 µg/m³2025-12-31: 25.4 µg/m³2026-01-01: 27.9 µg/m³2026-01-02: 25.6 µg/m³2026-01-03: 22.2 µg/m³2026-01-04: 18.9 µg/m³2026-01-05: 19.9 µg/m³2026-01-06: 21.0 µg/m³2026-01-07: 20.3 µg/m³2026-01-08: 20.3 µg/m³2026-01-09: 22.4 µg/m³2026-01-10: 23.7 µg/m³2026-01-11: 25.4 µg/m³2026-01-12: 28.2 µg/m³2026-01-13: 30.9 µg/m³2026-01-14: 32.0 µg/m³2026-01-15: 31.5 µg/m³2026-01-16: 31.8 µg/m³2026-01-17: 30.1 µg/m³2026-01-18: 25.8 µg/m³2026-01-19: 25.8 µg/m³2026-01-20: 27.2 µg/m³2026-01-21: 27.1 µg/m³2026-01-22: 28.5 µg/m³2026-01-23: 31.7 µg/m³2026-01-24: 31.3 µg/m³2026-01-25: 29.6 µg/m³2026-01-26: 30.9 µg/m³2026-01-27: 31.2 µg/m³2026-01-28: 32.4 µg/m³2026-01-29: 35.1 µg/m³2026-01-30: 38.2 µg/m³2026-01-31: 36.9 µg/m³2026-02-01: 39.4 µg/m³2026-02-02: 35.9 µg/m³2026-02-03: 25.7 µg/m³2026-02-04: 22.1 µg/m³2026-02-05: 24.4 µg/m³2026-02-06: 26.0 µg/m³2026-02-07: 29.0 µg/m³2026-02-08: 30.0 µg/m³2026-02-09: 30.5 µg/m³2026-02-10: 27.1 µg/m³2026-02-11: 26.9 µg/m³2026-02-12: 26.8 µg/m³2026-02-13: 28.2 µg/m³2026-02-14: 31.7 µg/m³2026-02-15: 35.7 µg/m³2026-02-16: 37.5 µg/m³2026-02-17: 40.4 µg/m³2026-02-18: 39.3 µg/m³2026-02-19: 33.4 µg/m³2026-02-20: 30.3 µg/m³2026-02-21: 30.4 µg/m³2026-02-22: 32.0 µg/m³2026-02-23: 39.5 µg/m³2026-02-24: 34.8 µg/m³2026-02-25: 28.2 µg/m³2026-02-26: 17.2 µg/m³2026-02-27: 18.6 µg/m³2026-02-28: 24.0 µg/m³2026-03-01: 33.7 µg/m³2026-03-02: 41.7 µg/m³2026-03-03: 61.7 µg/m³2026-03-04: 71.2 µg/m³2026-03-05: 73.0 µg/m³2026-03-06: 68.7 µg/m³2026-03-07: 60.3 µg/m³2026-03-08: 48.6 µg/m³2026-03-09: 49.9 µg/m³2026-03-10: 41.0 µg/m³2026-03-11: 29.7 µg/m³2026-03-12: 26.1 µg/m³2026-03-13: 23.1 µg/m³2026-03-14: 18.1 µg/m³2026-03-15: 25.1 µg/m³2026-03-16: 29.6 µg/m³2026-03-17: 24.6 µg/m³2026-03-18: 27.0 µg/m³2026-03-19: 36.9 µg/m³2026-03-20: 37.5 µg/m³2026-03-21: no data2026-03-22: 46.4 µg/m³2026-03-23: 31.7 µg/m³2026-03-24: 50.9 µg/m³2026-03-25: 76.5 µg/m³2026-03-26: 92.0 µg/m³2026-03-27: 111.0 µg/m³2026-03-28: 126.0 µg/m³2026-03-29: 156.0 µg/m³2026-03-30: 151.0 µg/m³2026-03-31: 139.0 µg/m³2026-04-01: 143.0 µg/m³2026-04-02: 168.0 µg/m³2026-04-03: 144.0 µg/m³2026-04-04: 136.0 µg/m³2026-04-05: 148.0 µg/m³2026-04-06: 134.0 µg/m³2026-04-07: 115.0 µg/m³2026-04-08: 94.5 µg/m³2026-04-09: 81.2 µg/m³2026-04-10: 88.5 µg/m³2026-04-11: 88.5 µg/m³2026-04-12: 98.6 µg/m³2026-04-13: 144.0 µg/m³2026-04-14: 134.0 µg/m³2026-04-15: 114.0 µg/m³2026-04-16: 125.0 µg/m³2026-04-17: 146.0 µg/m³2026-04-18: 134.0 µg/m³2026-04-19: 119.0 µg/m³2026-04-20: 99.7 µg/m³2026-04-21: 94.8 µg/m³2026-04-22: 88.0 µg/m³2026-04-23: 77.0 µg/m³2026-04-24: 56.8 µg/m³2026-04-25: 53.4 µg/m³2026-04-26: 34.7 µg/m³2026-04-27: 31.5 µg/m³2026-04-28: 31.3 µg/m³2026-04-29: 23.8 µg/m³2026-04-30: 28.8 µg/m³2026-05-01: 33.4 µg/m³2026-05-02: 48.6 µg/m³2026-05-03: 54.9 µg/m³2026-05-04: 50.7 µg/m³2026-05-05: 38.1 µg/m³2026-05-06: 26.6 µg/m³2026-05-07: 24.0 µg/m³2026-05-08: 18.7 µg/m³2026-05-09: 20.5 µg/m³2026-05-10: 18.6 µg/m³2026-05-11: 14.5 µg/m³2026-05-12: 13.2 µg/m³2026-05-13: 10.4 µg/m³2026-05-14: 9.4 µg/m³2026-05-15: 10.3 µg/m³2026-05-16: 9.1 µg/m³2026-05-17: 11.6 µg/m³2026-05-18: 13.7 µg/m³2026-05-19: 15.7 µg/m³2026-05-20: 18.2 µg/m³2026-05-21: 17.2 µg/m³2026-05-22: 17.3 µg/m³2026-05-23: 13.8 µg/m³2026-05-24: 11.7 µg/m³2026-05-25: 9.4 µg/m³2026-05-26: 11.4 µg/m³2026-05-27: 11.8 µg/m³2026-05-28: 16.7 µg/m³2026-05-29: 12.5 µg/m³2026-05-30: 10.1 µg/m³2026-05-31: 12.3 µg/m³2026-06-01: 15.0 µg/m³2026-06-02: 18.7 µg/m³2026-06-03: 17.5 µg/m³2026-06-04: 17.6 µg/m³2026-06-05: 11.6 µg/m³2026-06-06: 9.7 µg/m³2026-06-07: 10.1 µg/m³2026-06-08: 10.3 µg/m³2026-06-09: 10.4 µg/m³2026-06-10: 9.3 µg/m³2026-06-11: 8.5 µg/m³2026-06-12: 8.4 µg/m³2026-06-13: no data2026-06-14: 9.0 µg/m³2026-06-15: 8.3 µg/m³2026-06-16: 8.4 µg/m³2026-06-17: 8.9 µg/m³2026-06-18: 9.4 µg/m³2026-06-19: 10.8 µg/m³2026-06-20: 12.6 µg/m³2026-06-21: 11.1 µg/m³2026-06-22: 11.6 µg/m³2026-06-23: 12.4 µg/m³2026-06-24: 11.0 µg/m³2026-06-25: 10.4 µg/m³2026-06-26: 10.5 µg/m³2026-06-27: 11.1 µg/m³2026-06-28: 11.1 µg/m³2026-06-29: 11.0 µg/m³2026-06-30: 10.8 µg/m³2026-07-01: 11.3 µg/m³2026-07-02: no data2026-07-03: no data2026-07-04: no data2026-07-05: no data2026-07-06: no data2026-07-07: no data2026-07-08: no data2026-07-09: no data2026-07-10: no data2026-07-11: no data2026-07-12: no data2026-07-13: no data2026-07-14: no data2026-07-15: no data2026-07-16: no data2026-07-17: no data2026-07-18: no data2026-07-19: no data2026-07-20: no data2026-07-21: no data2026-07-22: no data2026-07-23: no data2026-07-24: no data2026-07-25: no data2026-07-26: no data2026-07-27: no data2026-07-28: no data2026-07-29: no data2026-07-30: 9.6 µg/m³2026-07-31: 8.3 µg/m³2026-08-01: 9.2 µg/m³2026-08-02: 9.1 µg/m³2026-08-03: 8.7 µg/m³2026-08-04: 8.9 µg/m³2026-08-05: 8.6 µg/m³2026-08-06: 8.4 µg/m³2026-08-07: 8.4 µg/m³2026-08-08: 7.3 µg/m³2026-08-09: 8.2 µg/m³2026-08-10: 7.7 µg/m³2026-08-11: 7.8 µg/m³2026-08-12: 8.3 µg/m³2026-08-13: 9.2 µg/m³2026-08-14: 9.5 µg/m³2026-08-15: 10.5 µg/m³2026-08-16: 9.4 µg/m³2026-08-17: 10.2 µg/m³2026-08-18: 11.6 µg/m³2026-08-19: 12.8 µg/m³2026-08-20: 10.9 µg/m³2026-08-21: 8.1 µg/m³2026-08-22: 8.2 µg/m³2026-08-23: 9.6 µg/m³2026-08-24: 11.5 µg/m³2026-08-25: 13.6 µg/m³2026-08-26: 11.5 µg/m³2026-08-27: 8.3 µg/m³2026-08-28: 9.1 µg/m³2026-08-29: 10.7 µg/m³2026-08-30: 10.8 µg/m³2026-08-31: 11.0 µg/m³2026-09-01: 9.7 µg/m³2026-09-02: 9.3 µg/m³2026-09-03: 9.0 µg/m³2026-09-04: no data2026-09-05: no data2026-09-06: 10.7 µg/m³2026-09-07: 10.5 µg/m³2026-09-08: 9.8 µg/m³2026-09-09: 9.3 µg/m³2026-09-10: 8.9 µg/m³2026-09-11: 8.6 µg/m³2026-09-12: 11.9 µg/m³2026-09-13: 15.5 µg/m³2026-09-14: 17.7 µg/m³2026-09-15: 13.9 µg/m³2026-09-16: 10.7 µg/m³2026-09-17: 9.6 µg/m³2026-09-18: 8.8 µg/m³2026-09-19: 7.3 µg/m³2026-09-20: 8.5 µg/m³2026-09-21: 8.3 µg/m³2026-09-22: 8.4 µg/m³2026-09-23: 11.9 µg/m³2026-09-24: 12.6 µg/m³2026-09-25: 12.0 µg/m³2026-09-26: 9.6 µg/m³2026-09-27: 7.3 µg/m³2026-09-28: 7.0 µg/m³2026-09-29: 8.6 µg/m³2026-09-30: 10.4 µg/m³2026-10-01: 12.0 µg/m³
175 of 294 measured days were over the WHO 24-hour guideline (15 µg/m³). One row per month, one square per local day.
Good0–5
Fair6–15
Moderate16–50
Poor51–90
Very poor91–140
Extremely poor141+

The European Environment Agency's air quality index bands for PM2.5 (2024 revision); it has bands, not numbers, so values stay in µg/m³. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Last 4 days, hour by hour

15302026-10-02 00:00 UTC: 13.3 µg/m³2026-10-02 01:00 UTC: 13.3 µg/m³2026-10-02 02:00 UTC: 13.4 µg/m³2026-10-02 03:00 UTC: 13.6 µg/m³Sep 29Sep 30Oct 1
Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Where it stood each day

Top 10Top 100#1#10#100#1,000#2,835NovDecJanFebMarAprMayJunJulAugSep#718
Its rank on each day's world board, #1 being the most polluted city that day. The scale is logarithmic: each step down is ten times as many cities. See it among every city.

2026 against 2025, month by month

15Jan 2026: 27.9 µg/m³JanFeb 2025: 42.1 µg/m³Feb 2026: 30.2 µg/m³FebMar 2025: 59.9 µg/m³Mar 2026: 60.3 µg/m³MarApr 2025: 31.9 µg/m³Apr 2026: 99.2 µg/m³AprMay 2025: 13.8 µg/m³May 2026: 19.5 µg/m³MayJun 2025: 12.3 µg/m³Jun 2026: 11.2 µg/m³JunJulAug 2026: 9.6 µg/m³AugSep 2025: 8.4 µg/m³Sep 2026: 10.2 µg/m³SepOct 2025: 9.0 µg/m³OctNov 2025: 17.6 µg/m³NovDec 2025: 22.1 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

This week against past years

This weekThis week: 9.6 µg/m³9.620252025: 7.8 µg/m³7.8
Mean PM2.5 for 25 Sept to 1 Oct in each year. Dashed line: WHO 24-hour guideline.

Monitors

StationOperatorType
Phayao Provincial, PhayaoPermission requested (Thailand PCD, Air4Thai, 2026-10-01)Air4ThaiReference

The city's value is the median of its reference monitors each hour, when at least a third of them report (three are always enough); low-cost sensors are listed but not counted when reference monitors exist. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Use this page

SmogRank, PM2.5 daily means, Phayao, Thailand, 2 Oct 2025 – 1 Oct 2026, smogrank.com/th/phayao (accessed 2 Oct 2026).

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Other cities in Thailand

30-day averages, µg/m³. All of Thailand.

Updated 2026-10-02 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors in µg/m³.