Air quality in Nonsan-si, South Korea today

Mr. Duck’s Air Quality Score

Unhealthy for sensitive groups for Nonsan-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 Nonsan‑si is classified as USG today. The primary pollutant identified is PM2.5, with a measured concentration of 44.0 µg/m³. In addition, the PM10 level is recorded at 59.0 µg/m³ based on 18 valid measurements.

These values reflect the current monitoring data provided through OpenAQ for Nonsan‑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 Nonsan‑si includes six measured pollutants – 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 values come from three monitoring stations, giving a total of 24 recent rows of data. Each pollutant’s most recent reading was recorded on 2026‑02‑10 at 18:00 UTC, so the information is fresh, having been updated within the last seven days.

Across the pollutants the observed ranges are fairly tight. CO values span from 0.32 ppm to 0.80 ppm with a median of about 0.57 ppm; NO₂ varies between 0.0072 ppm and 0.0235 ppm, centering near 0.017 ppm; O₃ is measured from 0.0057 ppm up to 0.0324 ppm, with a typical value around 0.0063 ppm. For the particulates, PM10 readings lie between 17 µg/m³ and 59 µg/m³, median 54.5 µg/m³, while PM2.5 ranges from 5 µg/m³ to 44 µg/m³ with a median of 30.5 µg/m³. SO₂ is the lowest‑concentration gas, recorded from 0.001 ppm to 0.0046 ppm and averaging about 0.0041 ppm.

The data show that all six pollutants are consistently reported across the three stations, but the number of rows per pollutant is identical (24), indicating uniform coverage rather than gaps for any specific contaminant. The spread between the 10th and 90th percentiles is modest for each gas – for example, CO’s 10th percentile is 0.374 ppm and its 90th percentile 0.752 ppm – suggesting limited variability in recent measurements. Because the dataset reflects only a snapshot from three sites on a single day, conditions elsewhere in Nonsan‑si or at other times may differ.

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 reflects 18 valid measurements and is Updated within 3 days, with the most recent reading recorded at 2026‑02‑10T18:00:00+00:00. This snapshot provides a current view of air quality in Nonsan‑si, but conditions can differ across neighborhoods and change throughout the day, so local variations may not be captured by these figures.

OpenAQ station rows