Air quality in Hachinohe, Japan today

Mr. Duck’s Air Quality Score

Good air today for Hachinohe, 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 Hachinohe is rated as Good today. The primary pollutant identified is PM2.5, with a measured concentration of 4.0 µg/m³ based on five valid observations reported through OpenAQ.

These measurements indicate that fine particulate levels are within the range associated with the Good category. 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 Hachinohe air‑quality feed contains data for six measured pollutants – carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), combined nitrogen oxides (NOX), fine particulate matter (PM₂.5) and sulfur dioxide (SO₂). The dataset comprises ten recent rows drawn from two monitoring sites, so each pollutant is represented by at most one or two observations.

The newest timestamps are fairly current for most gases: NO, NO₂, NOX, PM₂.5 and SO₂ were all last updated on 2026‑02‑10 22:00 UTC, giving a freshness of less than three days. CO is the outlier, with its only entry dated 2025‑04‑01 01:00 UTC, which the system flags as old data. Across the five up‑to‑date pollutants the median values are tightly clustered – NO sits at 0.001 ppm, NO₂ at 0.006 ppm, NOX at 0.007 ppm, and PM₂.5 at 4.0 µg/m³ – with minimum‑maximum ranges that differ by only a few thousandths of a ppm for the gases and half a µg/m³ for the particles.

Coverage is uneven: while NO, NO₂, NOX and PM₂.5 each have two recent rows, CO appears in just one older row and SO₂ shows a single reading of 0.0 ppm. The limited number of stations means that conditions can vary across the city, and the sparse CO record highlights that not all pollutants are monitored with equal frequency or recency. Consequently, while most measurements reflect very recent air quality, the dataset does contain gaps that should be considered when interpreting city‑wide trends.

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 five valid measurements and is updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 22:00 UTC. These values provide a snapshot of current conditions, but air quality can differ across neighborhoods and change throughout the day, so local variations may not be captured in this summary.

OpenAQ station rows