Air quality in Hachioji, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Hachioji, 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 Hachioji is currently assessed as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 12.0 µg/m³, based on thirteen valid observations collected via OpenAQ.

This assessment 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 Hachioji includes five measured pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), total oxides of nitrogen (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). Data come from three monitoring stations that together contributed 13 individual rows, so each station supplies several readings across the different gases.

All of the most recent values were recorded on 2026-02-10 at 22:00 UTC, which falls within the “updated within 3 days” freshness bucket for every pollutant. The NO reading reaches a maximum of 0.004 ppm (median 0.003 ppm) and spans from 0.002 to 0.004 ppm. NO₂ shows a slightly wider spread, with values ranging from 0.010 to 0.017 ppm and a median of 0.015 ppm. NOX, which aggregates the two nitrogen oxides, varies between 0.012 and 0.020 ppm, centering on a median of 0.019 ppm. PM2.5 concentrations are reported in micrograms per cubic metre; they range from 9 to 12 µg/m³, with both the minimum and median at 9 µg/m³ and a maximum of 12 µg/m³. Sulfur dioxide is the only pollutant without any detected concentration – all three rows for SO₂ record 0.0 ppm, with the most recent measurement taken at the Katakura‑cho address.

Because the data set contains multiple rows per station, the overall coverage is fairly dense for nitrogen oxides and PM2.5, while SO₂ has only a single reporting location and consistently zero values. The timestamps being uniformly recent means the snapshot reflects conditions as of early February 2026, but the limited number of stations implies that local variations within Hachioji may not be fully captured by this collection alone.

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 13 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 Hachioji’s air quality but conditions can differ across neighborhoods and change throughout the day, so local variations may exist beyond what is displayed here.

OpenAQ station rows