Air quality in Yilan City, Taiwan today
Mr. Duck’s Air Quality Score
Moderate air today for Yilan City, Taiwan
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Yilan City is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 11.0 and a PM10 reference value of 11.0, based on six valid observations collected through OpenAQ.
These figures provide a snapshot of the ambient conditions 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 air‑quality dataset for Yilan City contains a single monitoring location that reports six common pollutants: carbon monoxide (CO), nitrogen dioxide (NO₂, written as NO2), ozone (O₃, written as O3), particulate matter ≤10 µm (PM10), particulate matter ≤2.5 µm (PM2.5, written as PM25), and sulfur dioxide (SO₂). All six measurements were last updated on 2026‑02‑10 at 23:00 UTC, so the most recent data are less than a week old.
Across the dataset each pollutant shows exactly one recorded value, giving a minimum, median and maximum that are identical. CO is measured at 0.23 ppm, NO₂ at 0.003 ppm, O₃ at 0.02 ppm, PM10 at 11.0 µg/m³, PM2.5 also at 11.0 µg/m³, and SO₂ at 0.0005 ppm. Because there is only one row per pollutant, the spread (difference between minimum and maximum) is zero, indicating no observed variation within this snapshot.
The uniform freshness of the timestamps means that, for Yilan City, the available data are all recent rather than outdated or unknown. However, the single‑station coverage limits spatial detail; conditions can differ in other parts of the city or surrounding areas that are not captured by this lone measurement point. Consequently, while the dataset provides a clear and up‑to‑date picture of each listed pollutant at one location, it does not reflect possible variability across Yilan City as a whole.
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 for Yilan City is based on six valid measurements and was refreshed recently, with the latest update recorded at 2026‑02‑10T23:00:00+00:00 (updated within 3 days). This snapshot reflects conditions at the time of sampling; air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in the city.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| 宜蘭縣 - 宜蘭 | co | 0.23 | ppm | 2026-02-10 23:00 UTC |
| 宜蘭縣 - 宜蘭 | no2 | 0.003 | ppm | 2026-02-10 23:00 UTC |
| 宜蘭縣 - 宜蘭 | o3 | 0.02 | ppm | 2026-02-10 23:00 UTC |
| 宜蘭縣 - 宜蘭 | pm10 | 11.0 | µg/m³ | 2026-02-10 23:00 UTC |
| 宜蘭縣 - 宜蘭 | pm25 | 11.0 | µg/m³ | 2026-02-10 23:00 UTC |
| 宜蘭縣 - 宜蘭 | so2 | 0.0005 | ppm | 2026-02-10 23:00 UTC |