Air quality in Chiang Mai City Municipality, Thailand today

Mr. Duck’s Air Quality Score

Moderate air today for Chiang Mai City Municipality, Thailand

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

The air quality in Chiang Mai City Municipality is currently classified as Moderate. The primary pollutant identified for today is PM2.5 (fine particles).

Measurements from six valid observations show a PM2.5 concentration of 34.22 µg/m³. No PM10 value is available for this assessment. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.

Latest sensor values

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

What the data includes

The OpenAQ feed for Chiang Mai City Municipality contains data from four monitoring rows covering a range of eight measured pollutants: carbon monoxide (CO), nitrogen dioxide (NO₂), particulate matter sizes PM₁, PM₂·₅ and PM₁₀, relative humidity, sulfur dioxide (SO₂) – which is not reported in the current rows – temperature, and particle number concentration (UM003). The most recent observations are from 2026‑02‑10 22:00 UTC for PM₂·₅, PM₁, relative humidity, temperature and UM003, while the latest CO and NO₂ values date back to 2023‑02‑16 00:00 UTC. PM₁₀ is older still, last updated on 2025‑01‑13 23:00 UTC.

Across the four rows the data show a fairly wide spread for several key variables. PM₂·₅ values range from 19.6 to 36.1 µg/m³ with a median of about 27.2 µg/m³, while PM₁₀ varies between 26.0 and 51.4 µg/m³ (median ≈ 49.1 µg/m³). The smallest particles (PM₁) are recorded from 12.1 to 23.2 µg/m³ with a median near 21.6 µg/m³, indicating that the finer fraction tends to sit toward the higher end of its range. Temperature measurements span 21.4 °C to 28.1 °C (median ≈ 25.4 °C) and relative humidity from 46.6 % up to 91.2 % (median ≈ 59.5 %). The particle number concentration (UM003) shows the greatest variability, ranging from roughly 1,545 to 4,037 particles/cm³ with a median of about 2,239.

Because only four rows contribute data, coverage is limited and uneven: recent readings exist for most pollutants except CO, NO₂ and PM₁₀, which rely on older entries. Consequently, the snapshot reflects conditions at specific sites (e.g., Yupparaj Wittayalai School and locations labeled “Chiang moi”) rather than a city‑wide average, and actual air quality can differ across neighborhoods and times not captured by these timestamps.

Learn more about sources and filtering: About the data.

Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)

Latest sensor values (bars)

PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).

Data notes

The data shown are based on six valid measurements and were updated within 3 days, with the most recent reading recorded at 2026‑02‑10T22:00:00+00:00. This snapshot reflects conditions at a specific time and location; air quality can vary across different parts of Chiang Mai City Municipality and change throughout the day.

OpenAQ station rows