· Thailand · Wednesday to Tuesday, UTC+7
Thailand weekly air quality
Modelled US AQI · 8 cities · CAMS via Open-Meteo
Mean PM2.5: 10 µg/m³. Both means cover the selected cities hour by hour. They are not a national average or Thailand’s official index.
+2.9 AQI compared with the previous week’s mean of 43.8.
Highest hourly estimate: 142 in Chiang Mai · .
1344 of 1344 city-hours have a modelled AQI. These are estimates for roughly 45 km model grid cells, not monitoring-station measurements. How this report is made
Daily modelled US AQI
| Day | Mean AQI | Low–high | Mean PM2.5 (µg/m³) | City-hours |
|---|---|---|---|---|
| Wed, 3 Sep | 44.5Good | 16–65 | 9.1 | 192 / 192 |
| Thu, 4 Sep | 44.5Good | 20–70 | 9.5 | 192 / 192 |
| Fri, 5 Sep | 44.4Good | 24–70 | 10 | 192 / 192 |
| Sat, 6 Sep | 52.6Moderate | 29–93 | 12.9 | 192 / 192 |
| Sun, 7 Sep | 53.3Moderate | 25–142 | 11.5 | 192 / 192 |
| Mon, 8 Sep | 47.6Good | 18–104 | 9.1 | 192 / 192 |
| Tue, 9 Sep | 40Good | 20–82 | 7.7 | 192 / 192 |
Hourly means (UTC+7)
Each cell averages the selected cities’ modelled AQI for that hour.
| Day | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wed | 44 | 44 | 44 | 44 | 44 | 45 | 45 | 45 | 44 | 44 | 44 | 44 | 44 | 44 | 44 | 44 | 45 | 45 | 46 | 46 | 45 | 45 | 45 | 45 |
| Thu | 45 | 44 | 44 | 44 | 44 | 44 | 44 | 43 | 44 | 44 | 44 | 44 | 44 | 44 | 44 | 44 | 45 | 46 | 46 | 47 | 46 | 46 | 45 | 45 |
| Fri | 44 | 44 | 44 | 44 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 43 | 44 | 45 | 45 | 45 | 47 | 47 | 47 | 46 | 46 | 47 |
| Sat | 47 | 48 | 48 | 49 | 50 | 50 | 51 | 51 | 52 | 52 | 52 | 53 | 53 | 53 | 54 | 54 | 53 | 54 | 58 | 59 | 57 | 55 | 54 | 55 |
| Sun | 55 | 55 | 55 | 55 | 54 | 54 | 53 | 53 | 53 | 53 | 52 | 52 | 52 | 52 | 51 | 51 | 52 | 55 | 57 | 58 | 56 | 53 | 50 | 50 |
| Mon | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 49 | 48 | 48 | 48 | 47 | 47 | 47 | 47 | 46 | 46 | 46 | 46 | 46 | 45 | 45 | 44 |
| Tue | 44 | 43 | 42 | 41 | 41 | 40 | 40 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 39 | 40 | 40 | 40 | 40 | 40 | 40 | 39 |
Cities by modelled US AQI
Sorted by weekly mean. Each city is a single model grid cell near its centre.
| City | Mean AQI | Peak AQI | Mean PM2.5 (µg/m³) | Hours |
|---|---|---|---|---|
| Chiang Mai | 73Moderate | 142 | 20.7 | 168 / 168 |
| Bangkok | 54.1Moderate | 93 | 11.9 | 168 / 168 |
| Khon Kaen | 53.9Moderate | 67 | 11 | 168 / 168 |
| Nakhon Ratchasima | 51.2Moderate | 65 | 10.7 | 168 / 168 |
| Chiang Rai | 43.8Good | 54 | 8 | 168 / 168 |
| Hat Yai | 35.9Good | 50 | 6.5 | 168 / 168 |
| Phuket | 33.7Good | 50 | 6.1 | 168 / 168 |
| Pattaya | 28Good | 41 | 4.9 | 168 / 168 |
City-hours by category
Good: 764
Moderate: 571
Unhealthy for Sensitive Groups: 9
Unhealthy: 0
Very Unhealthy: 0
Hazardous: 0
| AQI | Category |
|---|---|
| 0–50 | Good |
| 51–100 | Moderate |
| 101–150 | Unhealthy for Sensitive Groups |
| 151–200 | Unhealthy |
| 201–300 | Very Unhealthy |
| 301+ | Hazardous |
How this report is made
Open-Meteo provides hourly estimates from the Copernicus Atmosphere Monitoring Service (CAMS) global model at roughly 45 km resolution. We use the grid cell nearest each city’s centre. Nearby places may share a cell, and local pollution can differ.
The AQI is the provider’s modelled US AQI across pollutants, one value per city per hour. Weekly, daily and hourly means average those values across the selected cities. PM2.5 is a concentration in µg/m³. These figures use a different basis from the measured PM2.5-derived AQI in the Malaysia and Singapore reports.
Days and hours use UTC+7. The report includes past model hours only, never forecasts. The previous-week comparison appears only when at least 90% of that week’s city-hours are available.
For official local readings and advice, visit Pollution Control Department · Air4Thai. Air-quality data: Open-Meteo and CAMS, licensed under CC BY 4.0. Haze Monitor is independent of these providers and local authorities.