Air quality in Hyuga, Japan today

Mr. Duck’s Air Quality Score

Good air today for Hyuga, 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 Hyuga is classified as Good today. The primary pollutant identified is PM2.5 (fine particles).

Measurements show a PM2.5 concentration of 6.0 µg/m³, based on five valid observations reported through OpenAQ. No PM10 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 dataset for Hyuga currently draws from a single monitoring location at 日向市春原町１丁目４７, so all reported values come from one site. Five pollutants are represented: nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). Each pollutant has a single recorded value because the station supplied only one row of data for each, all logged at the same moment on 2026‑02‑10 22:00 UTC. The most recent timestamp across the whole set is therefore 2026‑02‑10 22:00 UTC, which falls within the “updated within three days” freshness bucket.

The measured concentrations are very uniform because only one observation exists for each pollutant. NO registers at 0.001 ppm, NO₂ at 0.012 ppm, NOX at 0.013 ppm and SO₂ also at 0.001 ppm; the PM2.5 reading is 6.0 µg/m³. Because there is no spread of values, the minimum, median, maximum, 10th percentile and 90th percentile are identical for every pollutant. This lack of variability means the data cannot illustrate any range or trend within the city.

With just one monitoring station, spatial coverage is limited; conditions elsewhere in Hyuga may differ from those captured at this single point. The dataset’s freshness is good—every entry was recorded less than three days ago—but the very small sample size restricts how comprehensively it reflects overall air quality across the municipality.

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 Hyuga reflects five valid measurements and was updated within 3 days, with the latest refresh recorded at 2026‑02‑10T22:00:00+00:00. While these figures provide a current snapshot of citywide air quality, conditions can differ across neighborhoods and change throughout the day, so local variations may not be captured in this summary.

OpenAQ station rows