Air quality in Seosan-si, South Korea today

Mr. Duck’s Air Quality Score

Moderate air today for Seosan-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 in Seosan‑si is currently classified as Moderate. The primary pollutant identified is PM2.5, fine particulate matter, with a measured concentration of 23.0 µg/m³. In addition, the level of larger particles (PM10) has been recorded at 44.0 µg/m³ based on 18 valid observations.

These values reflect the latest data shown via OpenAQ for Seosan‑si. 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 Seosan‑si contains measurements for six common air‑quality gases and particles: carbon monoxide (CO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter 10 µm or less (PM10), particulate matter 2.5 µm or less (PM2.5) and sulfur dioxide (SO₂). All of these pollutants are reported from a total of twenty‑four individual rows, which correspond to three monitoring stations that feed the OpenAQ network.

The most recent values for each pollutant were all recorded on 2026‑02‑10 at 18:00 UTC, so the data is fresh within the last seven days. Across the six species the observed ranges are fairly narrow. CO varies from a low of 0.28 ppm to a high of 0.50 ppm with a median of 0.40 ppm; NO₂ spans 0.0091‑0.0158 ppm (median 0.0118 ppm); O₃ ranges between 0.0089‑0.0365 ppm (median 0.0259 ppm). For the particulate fractions, PM10 values sit from 23 µg/m³ up to 44 µg/m³ (median 25 µg/m³) while PM2.5 is clustered tightly between 23 and 25 µg/m³ (median 23.5 µg/m³). SO₂ shows the smallest spread, from 0.0031‑0.005 ppm with a median of 0.00325 ppm.

Because all rows come from just three sites, spatial coverage is limited; conditions can differ across neighborhoods that are not directly represented by these stations. The data set also includes a small number of older entries—six rows are marked as “old”—but the majority (eighteen) fall within the last seven days, indicating that most of the information reflects recent air quality rather than long‑term historical trends.

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 Seosan‑si includes 18 valid measurements and is Updated within 3 days, with the most recent values recorded at 2026-02-10T18:00:00+00:00. These figures represent a snapshot of conditions across the monitoring network; actual air quality can differ by specific location and time of day within the city, so individual experiences may vary from the reported averages.

OpenAQ station rows