Air quality in Yangsan-si, South Korea today

Mr. Duck’s Air Quality Score

Moderate air today for Yangsan-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 Yangsan‑si is classified as Moderate. The primary pollutant identified for the current assessment is PM2.5 (fine particles).

Measurements show a PM2.5 reference value of 28.0 and a PM10 reference value of 23.0, based on 18 valid observations collected via OpenAQ. 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 Yangsan‑si dataset currently contains six measured 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). These values come from 18 individual rows collected at three monitoring stations, all of which were last updated on 2026‑02‑10 18:00 UTC, so the data are fresh within the past week.

Across the city the recorded CO levels range from a low of 0.29 ppm to a high of 0.38 ppm, with a median of 0.33 ppm; NO₂ varies between 0.0098 and 0.033 ppm (median 0.0124 ppm); O₃ spans 0.0099‑0.0322 ppm (median 0.0309 ppm). For the particulate metrics, PM10 is consistently around 18‑23 µg/m³ (median 18 µg/m³) while PM2.5 shows a broader spread from 9 to 28 µg/m³ (median 12 µg/m³). SO₂ values are low and tightly clustered, ranging from 0.002 to 0.0031 ppm with a median of 0.0022 ppm.

The dataset offers full coverage for each pollutant at every station, but the number of observations differs slightly: CO, NO₂, O₃, PM10, PM2.5 and SO₂ all have three recent records, reflecting uniform reporting across the network. The percentile values show that most measurements sit near the lower end of their ranges (e.g., 90 % of CO readings are below 0.37 ppm), indicating limited variability for gases, whereas particulate matter exhibits a wider distribution, especially PM2.5 where the 90th percentile reaches 24.8 µg/m³. Because the data represent only three sites, conditions can still vary across other parts of Yangsan‑si and at different times of day.

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 Yangsan‑si is based on 18 valid measurements and was refreshed recently, with the latest update recorded at 2026‑02‑10T18:00:00+00:00 (updated within 3 days). This snapshot reflects conditions at the time of collection; however, air quality can vary across different neighborhoods and times of day within the city.

OpenAQ station rows