Air quality in Asan-si, South Korea today

Mr. Duck’s Air Quality Score

Moderate air today for Asan-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 Asan‑si is currently assessed as Moderate. The primary pollutant identified is PM2.5, fine particulate matter, with a measured concentration of 29.0 µg/m³. In addition, the level of larger particles (PM10) is recorded at 37.0 µg/m³ based on 42 valid observations.

Data are shown via OpenAQ and reflect the latest available measurements 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 Asan‑si contains measurements for six key pollutants – carbon monoxide (CO), nitrogen dioxide (NO₂, reported as NO2), ozone (O₃, reported as O3), particulate matter 10 µm or smaller (PM10), fine particulate matter 2.5 µm or smaller (PM2.5, reported as PM25) and sulfur dioxide (SO₂). These values come from 48 recent observation rows collected across seven monitoring stations in the city. All of the records have a timestamp of 2026‑02‑10 18:00 UTC, which falls within the “updated within 7 days” freshness category, so the data reflect conditions that were measured only a few days ago.

Across the pollutants the observed concentrations span a fairly wide range. CO values vary from a low of 0.26 ppm to a high of 0.43 ppm, with a median around 0.38 ppm; NO₂ ranges between 0.0049 ppm and 0.0128 ppm, median 0.01075 ppm; O₃ shows the greatest spread, from 0.0058 ppm up to 0.0681 ppm, median roughly 0.0213 ppm. Particulate matter is measured in micrograms per cubic metre: PM10 values are as low as 20 µg/m³ and peak at 294 µg/m³, with a median of 27.5 µg/m³; PM2.5 ranges from 15 µg/m³ to 73 µg/m³, also medially 27.5 µg/m³. SO₂ is the least variable, staying between 0.003 ppm and 0.0041 ppm, median about 0.0035 ppm.

The data set shows a fairly balanced coverage of all six pollutants, with each having recent readings from the same seven stations. However, the number of rows (48) indicates that many individual measurements are repeated across time or location, so spatial variation within Asan‑si may not be fully captured. While the timestamps are uniformly fresh, the relatively small station count means conditions can still differ by neighbourhood and moment, and users should keep in mind that these figures represent a snapshot rather than continuous city‑wide monitoring.

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 Asan‑si includes 42 valid measurements and is marked as Updated within 3 days; the latest values were recorded at 2026‑02‑10T18:00:00+00:00. While these figures provide a current overview of citywide air quality, conditions can differ across neighborhoods and change throughout the day, so this snapshot may not reflect localized or moment‑to‑moment variations.

OpenAQ station rows