Air quality in Seongnam-si, South Korea today

Mr. Duck’s Air Quality Score

Unhealthy for sensitive groups for Seongnam-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 Seongnam‑si is classified as USG. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 41.0 µg/m³ and a PM10 level of 53.0 µg/m³, based on 45 valid observations collected via 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 dataset for Seongnam‑si pulls in measurements from eight monitoring stations, giving a total of fifty‑four individual rows of data. All six pollutants tracked by the OpenAQ feed—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)—are represented, and each of them has a most recent reading dated 2026‑02‑10 18:00 UTC, which falls within the “updated within seven days” freshness bucket.

Across the city the recorded values show a fairly tight spread for most gases. CO ranges from 0.45 to 0.99 ppm with a median of 0.64 ppm; NO₂ varies between 0.0122 and 0.042 ppm, centering on 0.0279 ppm; O₃ is low, moving from 0.001 to 0.0169 ppm with a median of 0.0061 ppm. Sulfur dioxide also stays modest, spanning 0.0015‑0.0066 ppm and averaging around 0.0019 ppm. Particulate matter shows broader variability: PM10 values sit between 15 and 59 µg/m³, the median being 49 µg/m³, while PM2.5 has a minimum of 33 µg/m³ and an unusually high maximum of 9 999 µg/m³, with the typical reading at 41 µg/m³. The extreme upper bound for PM2.5 suggests either a data‑entry anomaly or a rare spike captured by one station.

Overall the coverage is fairly comprehensive in terms of pollutant types and recentness, but the number of stations (eight) means that conditions can differ across neighborhoods, especially for particulate matter where the spread is larger. The dataset’s freshness—all timestamps from the same recent hour—provides a current snapshot, yet users should keep in mind that local variations may not be fully captured by this limited station network.

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 Seongnam‑si is based on 45 valid measurements and has been updated within 3 days, with the most recent release recorded at 2026‑02‑10T18:00:00+00:00. While this snapshot reflects current monitoring conditions, air quality can differ across neighborhoods and change throughout the day, so local variations may not be captured in these figures.

OpenAQ station rows