Air quality in Ena, Japan today

Mr. Duck’s Air Quality Score

Good air today for Ena, 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 Ena is classified as Good today. The primary pollutant identified is PM2.5 (fine particles), with a measured concentration of 3.0 µg/m³. Five valid measurements support this assessment, and no PM10 value is available.

Data are shown via 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

Ena’s OpenAQ feed currently provides data for five pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). The dataset consists of a single monitoring location that contributes one row per pollutant, giving a total of five rows of recent observations.

All measurements were last updated on 2026-02-10 22:00 UTC, which falls within the “updated within three days” freshness window, so the data represent the most current snapshot available for the city. For each pollutant the recorded values are identical across the minimum, median and maximum statistics, indicating no observed variation in this short reporting period. NO is reported at 0.005 ppm, NO₂ at 0.013 ppm, NOX at 0.018 ppm, PM2.5 at 3.0 µg/m³ and SO₂ at 0.0 ppm.

Because the dataset contains only one sensor site, coverage is limited to that specific address in 長島町正家後田. Consequently, spatial variability across Ena cannot be assessed from these figures alone; conditions elsewhere in the city may differ. The uniformity of the values also means there is no spread to describe – each pollutant’s range collapses to a single point measurement for the reported hour. While the timestamps are fresh, the lack of multiple stations or historical rows (no data older than three days) restricts any analysis of trends over time. Users should keep in mind that this snapshot reflects conditions at one location and moment, not the broader citywide air quality picture.

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 current data for Ena are based on five valid measurements and were refreshed recently, having been updated within three days (last update: 2026‑02‑10 22:00 UTC). This snapshot reflects conditions at the time of sampling; air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in the city.

OpenAQ station rows