Air quality in Phra Nakhon Si Ayutthaya City Municipality, Thailand today
Mr. Duck’s Air Quality Score
Moderate air today for Phra Nakhon Si Ayutthaya City Municipality, Thailand
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Phra Nakhon Si Ayutthaya City Municipality is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles), with a measured concentration of 31.8 µg/m³.
Data are shown via OpenAQ and represent one valid measurement for today. 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 dataset for Phra Nakhon Si Ayutthaya City Municipality contains a single monitoring location – the sensor at Ayutthaya Witthayalai School – which supplies one row of data for each of the five pollutants tracked: nitrogen dioxide (NO2), ozone (O3), particulate matter ≤ 10 µm (PM10), particulate matter ≤ 2.5 µm (PM2.5) and sulfur dioxide (SO2). Because there is only one station, coverage across the city is limited to this point.
The most recent measurement in the whole set is a PM2.5 reading from 2026‑02‑10 22:00 UTC; all other pollutants have older timestamps ranging from mid‑2022 to early‑2023. This means that for four of the five substances the latest available values are at least three years old, while only PM2.5 is updated within the last week.
All recorded values are identical across their minimum, median and maximum statistics, indicating no observed variation in this single location: NO2 registers 0.0 ppm, O3 0.009 ppm, PM10 88.0 µg/m³, PM2.5 31.8 µg/m³ and SO2 0.002 ppm. The lack of spread (p10 = p90) reflects the single‑row nature of the data rather than stable air quality.
Because the dataset consists of one row per pollutant and most timestamps are old, it provides only a snapshot of conditions at one school site and does not capture spatial or temporal changes across Ayutthaya. Users should keep in mind that actual city‑wide air quality may differ from these point measurements, especially given the limited freshness of four pollutants.
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 reflects a single valid measurement and is Updated within 3 days, with the latest reading recorded on 2026‑02‑10 at 22:00 UTC. This snapshot represents conditions at one monitoring point and may not capture variations across different neighborhoods or times of day within Phra Nakhon Si Ayutthaya City Municipality. Consequently, actual air quality can differ locally and change rapidly.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Ayutthaya Witthayalai School | no2 | 0.0 | ppm | 2022-03-07 13:00 UTC |
| Ayutthaya Witthayalai School | o3 | 0.009 | ppm | 2022-07-17 05:00 UTC |
| Ayutthaya Witthayalai School | pm10 | 88.0 | µg/m³ | 2023-02-16 00:00 UTC |
| Ayutthaya Witthayalai School | pm25 | 31.8 | µg/m³ | 2026-02-10 22:00 UTC |
| Ayutthaya Witthayalai School | so2 | 0.002 | ppm | 2023-02-16 00:00 UTC |