Air quality in Joso, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Joso, 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 Joso is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles).

Measurements show a PM2.5 concentration of 24.0 µg/m³, based on five valid observations reported through OpenAQ. No PM10 reference value is available for this assessment. 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 Joso dataset includes five measured pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). All observations come from a single monitoring site located at 常総市水海道森下町4474‑2, so the city’s air‑quality picture is based on one station and five data rows.

Each pollutant shows a single recorded value with no spread: NO registers 0.001 ppm, NO₂ 0.017 ppm, NOX 0.018 ppm, PM2.5 24.0 µg/m³ and SO₂ 0.0 ppm. The minimum, median and maximum for every metric are identical, indicating that only one measurement per pollutant is currently available. Because the most recent update timestamp for all five parameters is 2026‑02‑10 22:00 UTC, the data are fresh – they were recorded within three days of today (2026‑02‑13).

With just one monitoring location, spatial coverage across Joso is limited; conditions elsewhere in the city may differ from those captured at this point. The dataset also lacks historical depth, as there are no older or unknown‑age rows to show trends over time. Consequently, while the available numbers give a clear snapshot of current concentrations at the specific site, they do not reflect variability across neighborhoods or longer‑term changes.

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 for Joso reflects five valid measurements and is updated within 3 days, with the most recent reading recorded at 2026‑02‑10T22:00:00+00:00. While these figures provide a current snapshot of air quality across the city, conditions can differ by specific location and time of day, so individual experiences may vary from the reported values.

OpenAQ station rows