Air quality in Wonju-si, South Korea today

Mr. Duck’s Air Quality Score

Unhealthy for sensitive groups for Wonju-si, South Korea

⚠️ 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 today in Wonju‑si is classified as USG. The primary pollutant identified is PM2.5, with a measured concentration of 54.0 µg/m³. In addition, PM10 levels are recorded at 71.0 µg/m³ based on 23 valid measurements.

Data is shown via OpenAQ and reflects the current assessment 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 dataset for Wonju‑si includes six common air‑quality pollutants – carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter ≤ 10 µm (PM10), particulate matter ≤ 2.5 µm (PM2.5) and sulfur dioxide (SO₂). All four monitoring stations that report to OpenAQ contribute a total of 24 recent observations, meaning each station supplies roughly six readings across the pollutants. The most recent timestamp for every pollutant is 2026‑02‑10 17:00 UTC, which falls within the “updated within 7 days” freshness bucket, so the data are currently up‑to‑date.

Across the four stations the measured values show a fairly narrow spread for the gases but a much wider range for the particulates. CO varies from a low of 0.42 ppm to a high of 1.27 ppm, with a median of 0.525 ppm; NO₂ runs between 0.0177 ppm and 0.038 ppm (median 0.0271 ppm); O₃ is recorded from 0.0029 ppm up to 0.0133 ppm (median 0.0064 ppm). In contrast, PM10 values sit between 58 µg/m³ and 71 µg/m³ (median 65 µg/m³), while PM2.5 spans an extreme range from the minimum of 50 µg/m³ to a maximum reported as 9 999 µg/m³, with a median of 52.5 µg/m³ and a 90th‑percentile near 7 016 µg/m³. SO₂ is the least variable, ranging from 0.0025 ppm to 0.0062 ppm (median 0.00295 ppm).

Because all six pollutants are represented at each of the four stations and the latest updates are less than a week old, the dataset offers a contemporaneous snapshot of Wonju‑si’s air quality. However, the very wide upper bound for PM2.5 suggests occasional spikes that may not be captured uniformly across locations, highlighting that conditions can differ markedly by place and time even within this short reporting window.

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 Wonju‑si reflects 23 valid measurements and is refreshed Updated within 3 days, with the latest values recorded at 2026‑02‑10T17:00:00+00:00. This snapshot represents conditions measured at specific monitoring sites and times; air quality can differ across neighborhoods and throughout the day, so individual experiences may vary from the figures presented here.

OpenAQ station rows