2025-03-30
During week 14, air quality worsened significantly in Chiang Rai, where PM2.5 levels – the fine dust that often forms the basis of AQI – reached unhealthy levels early in the week. Bangkok also experienced very poor air quality, especially on Monday and Tuesday. Phuket showed stable temperatures and moderate air quality, despite persistent rain.
Chiang Rai: Very high PM2.5 levels and heat wave
Monday, March 31: AQI 157 – Unhealthy, high temperature 40°C, low 21°C. Partly cloudy.
Tuesday 1 April: AQI 158 – Unhealthy, highest temperature 39°C, lowest 23°C. Cloudy.
Wednesday, April 2: AQI 168 – Unhealthy, highest temperature 37°C, lowest 23°C. Rain.
Thursday, April 3: AQI 178 – Unhealthy, highest temperature 36°C, lowest 23°C. Rain.
Friday, April 4: AQI 168 – Unhealthy, highest temperature 38°C, lowest 23°C. Cloudy.
Change from week 13: Air quality has deteriorated to dangerous levels. Temperatures remain very high.
Bangkok: Heavy air pollution at the beginning of the week
Monday, March 31: AQI 116 – Unhealthy for sensitive groups, highest temperature 32°C, lowest 28°C. Rain.
Tuesday 1 April: AQI 129 – Unhealthy for sensitive groups, highest temperature 34°C, lowest 28°C. Rain.
Wednesday, April 2: AQI 105 – Unhealthy for sensitive groups, highest temperature 32°C, lowest 29°C. Rain.
Thursday, April 3: AQI 84 – Moderate air quality, highest temperature 30°C, lowest 27°C. Rain.
Friday, April 4: AQI 72 – Moderate air quality, highest temperature 33°C, lowest 26°C. Rain.
Change from week 13: Air pollution is severe at the beginning of the week but improves somewhat towards the end. Temperatures remain high.
Phuket: Continued rain and moderate air quality
Monday, March 31: AQI 56 – Moderate air quality, highest temperature 29°C, lowest 27°C. Rain.
Tuesday 1 April: AQI 54 – Moderate air quality, highest temperature 29°C, lowest 27°C. Rain.
Wednesday, April 2: AQI 58 – Moderate air quality, highest temperature 28°C, lowest 26°C. Rain.
Thursday, April 3: AQI 71 – Moderate air quality, highest temperature 27°C, lowest 26°C. Rain.
Friday, April 4: AQI 74 – Moderate air quality, highest temperature 28°C, lowest 26°C. Rain.
Change from week 13: No major changes. Continued rain and stable air quality.
Summary and recommendations
Chiang Rai: Very poor air quality and high temperatures all week.
Bangkok: Severe air pollution during Monday to Wednesday, with some improvement later.
Phuket: Stable and rainy weather with moderate air quality.
What does AQI mean?
The AQI (Air Quality Index) is an index that shows how healthy or unhealthy the air is. It is usually based on the levels of PM2.5 – small particles in the air that are smaller than 2,5 micrometers. The higher the value, the worse the air quality. Values above 100 affect sensitive groups, while levels above 150 can be harmful to everyone.
| AQI category | Health advice |
|---|---|
| 0-33 Very good | Enjoy outdoor activities |
| 34-66 Good | Enjoy outdoor activities |
| 67-99 Moderate | People who are unusually sensitive to air pollution should plan strenuous outdoor activities when the air quality is better. |
| 100-149 Poor | Sensitive groups: Reduce or reschedule strenuous outdoor activities |
| 150-200 Very poor | Sensitive groups: Avoid strenuous outdoor activities Everyone: Reduce or reschedule strenuous outdoor activities |
| 200+ Dangerous | Sensitive groups: Avoid all physical activity outdoors Everyone: Severely limit outdoor activities |
Source: Air quality data is taken from IQ Air.
Stay informed and protect your health.
Text: The editorial staff
Image license: Quang Praha, Pixabay, original image
Thailand Info publishes news in Swedish. Translations into other languages are done automatically using modern tools. Minor errors in the translation may occur. The aim is to make our news available to a wider audience worldwide. Do you find something that seems wrong in the translation? Please contact us at ✉️ info@thailandinfo.se so that we can fix it.