Air quality in Tainan, Taiwan today

Mr. Duck’s Air Quality Score

Unhealthy for sensitive groups for Tainan, Taiwan

⚠️ 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 Tainan is classified as USG today. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 39.0 µg/m³ and a PM10 level of 63.0 µg/m³, based on 24 valid observations reported through OpenAQ.

These values reflect the current monitoring results for the city. 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 Tainan includes measurements of carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter of three size fractions (PM₁, PM₂.5 and PM₁₀), sulfur dioxide (SO₂), relative humidity and temperature. Data are drawn from ten monitoring stations across the city, giving a total of ten rows of observations.

For most pollutants the latest values were recorded on 2026‑02‑10 at 23:00 UTC, meaning the data are fresh within the past week. CO, NO₂, O₃, SO₂, PM₁₀ and PM₂.5 all show a “Updated within 7 days” flag, with their most recent readings ranging from 0.0 to 0.52 ppm for gases and from 14.0 to 64.0 µg/m³ for particulates. The median concentrations are 0.32 ppm for CO, 0.013 ppm for NO₂, 0.011 ppm for O₃, 0.0013 ppm for SO₂, 44.5 µg/m³ for PM₁₀ and 22.5 µg/m³ for PM₂.5, while the inter‑percentile spread (10th–90th percentile) shows that most values sit between roughly 16.7 and 63.1 µg/m³ for PM₁₀ and between 6.9 and 35.4 µg/m³ for PM₂.5.

Two pollutants have notably less recent information: PM₁ and relative humidity lack a timestamp, so their freshness is unknown and they appear only as single‑row entries with static values (PM₁ at about 21.2 µg/m³ and humidity near 60 %). Consequently, coverage of these variables is uneven compared with the other six pollutants that benefit from regular updates across multiple stations.

Overall, Tainan’s dataset provides recent, multi‑station coverage for most key air quality gases and larger particulates, but the sparse and outdated reporting for PM₁ and humidity means those aspects of the city’s atmosphere are less well captured at any given moment.

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 dataset for Tainan includes 24 valid measurements and is updated within 3 days, with the most recent values recorded at 2026‑02‑10T23:00:00+00:00. These figures represent a snapshot of conditions across the city; air quality can differ by specific location and time of day, so individual experiences may vary from the reported averages.

OpenAQ station rows