Air quality in Hayashima, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Hayashima, 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 Hayashima is currently classified as Moderate. The main pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 18.0 µg/m³, based on eight valid observations reported through OpenAQ.

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

Hayashima’s open‑air quality feed currently provides data for four pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX) and fine particulate matter (PM2.5). The dataset draws from two monitoring locations, giving a total of eight recent rows of observations. All values were last refreshed on 2026‑02‑10 22:00 UTC, so the information is current within the past three days for every pollutant.

The measured concentrations show modest variability. NO levels range from 0.002 to 0.020 ppm, with a median of about 0.011 ppm and most values (the 10th‑90th percentile band) falling between roughly 0.004 and 0.018 ppm. NO₂ is slightly higher overall, spanning 0.013–0.018 ppm; the median sits at 0.0155 ppm and the central 80 % of readings lie between 0.014 and 0.0175 ppm. For total nitrogen oxides, the spread is broader: values run from 0.015 to 0.038 ppm, a median of 0.0265 ppm and an inter‑percentile range of about 0.017–0.036 ppm. PM2.5 concentrations are reported in micrograms per cubic metre, ranging from 14.0 to 18.0 µg/m³; the median is 16.0 µg/m³ with most observations (10th‑90th percentile) between 14.4 and 17.6 µg/m³.

Because only two stations contribute data, spatial coverage across Hayashima is limited, and any single reading reflects conditions at a specific site rather than the whole town. Nonetheless, the dataset is uniformly recent, with no rows flagged as old or unknown, providing a timely snapshot of the city’s air quality on the day of reporting.

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 eight valid measurements and is updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 22:00 UTC. This snapshot provides a current view of Hayashima’s air quality, but conditions can differ across neighborhoods and change throughout the day, so local variations may not be captured in these figures.

OpenAQ station rows