Air quality in Koto, Japan today

Mr. Duck’s Air Quality Score

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

Measurements from OpenAQ show a PM2.5 concentration of 18.0 µg/m³ based on fifteen valid observations. No PM10 reference value is available for this assessment. 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 Koto pulls in measurements from three monitoring sites that together provide fifteen recent observations across six common air‑quality pollutants. All of the values shown were last updated on 2026‑02‑10 22:00 UTC, so the information reflects conditions recorded within the past three days.

Carbon monoxide (CO) appears in two rows with concentrations ranging from 0.3 to 0.4 ppm; the median reading is 0.35 ppm. Nitric oxide (NO), nitrogen dioxide (NO₂) and total nitrogen oxides (NOX) each have three recent entries. NO varies between 0.002 and 0.009 ppm (median 0.004 ppm), NO₂ sits from 0.025 to 0.034 ppm (median 0.027 ppm) and NOX spans 0.027 to 0.043 ppm (median 0.031 ppm). Particulate matter ≤2.5 µm (PM2.5) is reported in three rows as well, with values from 16.0 to 18.0 µg/m³ and a median of 17.0 µg/m³. Sulfur dioxide (SO₂) is the only pollutant with a single recent measurement, recorded at 0.0 ppm.

The coverage is uneven: while NO, NO₂, NOX and PM2.5 each have three observations, CO is represented by just two rows and SO₂ by one. Nevertheless, every pollutant in the list has at least one fresh reading, so the dataset captures a snapshot of current air quality across Koto. Because the number of stations is limited to three, conditions can differ between neighborhoods and times not captured by these points, meaning the figures give a useful but localized view of the city’s atmosphere on the date shown.

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 Koto reflects 15 valid measurements and is Updated within 3 days, with the latest values recorded at 2026‑02‑10T22:00:00+00:00. This snapshot provides a current view of ambient air quality but note that conditions can differ across neighborhoods and change throughout the day, so the figures may not represent every location or moment in the city.

OpenAQ station rows