Air quality in Aioi, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Aioi, 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 Aioi is currently classified as Moderate. The primary pollutant identified for today is PM2.5 (fine particles).

Measurements show a PM2.5 concentration of 14.0 µg/m³ based on nine valid observations collected through OpenAQ. This reflects the latest available data 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 Aioi includes five measured pollutants – carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX) and fine particulate matter (PM2.5). The information comes from nine individual sensor rows that are grouped into two monitoring stations, so each station contributes multiple readings for the same location. All of the latest values were recorded on 2026-02-10 at 22:00 UTC, which meets the “updated within three days” freshness criterion for every pollutant.

Across the nine rows the observed concentrations show very limited variation. For CO the single reading is 0.3 ppm, and this value appears in all rows that report carbon monoxide. NO values range from a minimum of 0.0 ppm to a maximum of 0.006 ppm, with a median of 0.003 ppm; the 10th‑percentile sits at 0.0006 ppm and the 90th‑percentile at 0.0054 ppm. NO₂ is recorded between 0.007 ppm and 0.011 ppm (median 0.009 ppm, 10th‑percentile 0.0074 ppm, 90th‑percentile 0.0106 ppm). NOX spans 0.007 ppm to 0.017 ppm (median 0.012 ppm, 10th‑percentile 0.008 ppm, 90th‑percentile 0.016 ppm). PM2.5 is constant at 14.0 µg/m³ in every row that measures particulates.

The coverage is uneven: CO is reported from only one sensor row, while NO, NO₂ and NOX each have two rows, and PM2.5 appears in three rows. Because the dataset contains a small number of recent observations, it captures only a snapshot of air quality at specific sites on a single day; conditions elsewhere in Aioi 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 are based on nine valid measurements and were refreshed recently, with the latest update recorded at 2026‑02‑10T22:00:00+00:00 (updated within three days). These values provide a snapshot of current conditions in Aioi, but air quality can differ across neighborhoods and change throughout the day, so local variations may not be fully captured.

OpenAQ station rows