Air quality in Marumori, Japan today

Mr. Duck’s Air Quality Score

Good air today for Marumori, 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 Marumori is classified as Good today. The primary pollutant identified is PM2.5, with a measured concentration of 6.0 µg/m³ based on five valid observations reported through OpenAQ.

These values indicate that the current atmospheric conditions meet the criteria for 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

Marumori’s air‑quality record is built from a single monitoring site that contributed five rows of data, one for each pollutant tracked in the OpenAQ feed. The dataset includes measurements of nitrogen monoxide (NO), nitrogen dioxide (NO₂), total oxidised nitrogen (NOX), fine particulate matter (PM2.5) and sulphur dioxide (SO₂). All five observations were last refreshed on 2026‑02‑10 at 22:00 UTC, which falls within the “updated within three days” freshness window, so the snapshot reflects very recent conditions for each compound.

The numeric values show a narrow spread across the board. NO, SO₂ and the combined NOX metric are all recorded as zero parts per million, indicating no detectable concentration at the time of sampling. NO₂ registers a constant 0.001 ppm, matching both its minimum and maximum reported levels. PM2.5 is measured at 6.0 µg/m³, again with identical min, median and max values, suggesting that only one reading was captured for each pollutant rather than a range of observations over time. Because the dataset consists of a single station, there is no geographic diversity within Marumori; conditions elsewhere in the town may differ from those at the monitoring point.

Overall, the data set provides complete coverage of the five listed pollutants but offers limited depth: every pollutant has exactly one recent entry, and the statistical spread (minimum, median, maximum, 10th‑percentile and 90th‑percentile) is identical for each. This means that while the information is fresh, it does not capture variability across locations or over longer periods, so any interpretation should keep in mind that air quality can change throughout the town and from day to day.

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 five valid measurements and were refreshed recently, with the latest update recorded at 2026‑02‑10T22:00:00+00:00 (updated within 3 days). This snapshot reflects conditions at a specific time and place; air quality can vary across different locations and moments throughout Marumori.

OpenAQ station rows