Air quality in Koriyama, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Koriyama, Japan

⚠️ 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 Koriyama is currently classified as Moderate. The primary pollutant identified is PM2.5, with a measured concentration of 16.0 µg/m³ based on ten valid observations.

Data are shown via OpenAQ and reflect the latest available readings for this location. 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 Koriyama includes six measured pollutants – carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO2), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO2). Data come from two monitoring stations, giving a total of ten rows of observations across the city. All readings were last updated on 2026-02-10 at 22:00 UTC, so the information is current within three days for every pollutant.

Across the two sites the recorded values show modest variation. NO concentrations range from 0.002 to 0.008 ppm with a median of 0.005 ppm; NO2 spans 0.016‑0.022 ppm (median 0.019 ppm); and NOX varies between 0.018 and 0.030 ppm (median 0.024 ppm). PM2.5 levels are higher in absolute terms, from 11.0 to 16.0 µg/m³ with a median of 13.5 µg/m³, while CO is reported at a single consistent value of 0.3 ppm and SO2 at a constant 0.001 ppm. The narrow spread for CO and SO2 reflects that each pollutant was captured by only one station, whereas NO, NO2, NOX and PM2.5 have data from both locations, giving a broader picture of city‑wide conditions.

Because the dataset contains just two stations, spatial coverage is limited; some neighborhoods may not be represented at all. Nevertheless, the timestamps are uniformly recent, indicating that the available measurements reflect the latest air quality snapshot for Koriyama rather than outdated or unknown data.

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 Koriyama is based on ten valid measurements and was updated within 3 days (last refresh: 2026‑02‑10 22:00 UTC). This snapshot reflects conditions at the time of sampling, but air quality can vary across different neighborhoods and times of day within the city.

OpenAQ station rows