Air quality in Kōchi, Japan today

Mr. Duck’s Air Quality Score

Good air today for Kōchi, 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 Kōchi today falls into the Good category according to the latest assessment. The primary pollutant identified is PM2.5, with a measured concentration of 6.0 µg/m³. Data are based on five valid measurements and are displayed via OpenAQ.

Overall conditions meet the criteria for a Good rating, reflecting low levels of fine particulate matter in the atmosphere. 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 Kōchi includes five measured pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). All values come from a single monitoring site, identified as 高知市介良丙１０００－２, so the city’s air‑quality picture is based on one location rather than a network of stations.

Each pollutant has a single recent record dated 2026-02-10 22:00 UTC, which falls within the “updated within three days” freshness window. The NO and SO₂ readings are both recorded at 0.0 ppm, while NO₂ and NOX each show 0.006 ppm. PM2.5 is reported as 6.0 µg/m³. Because only one observation per pollutant is available, the minimum, median and maximum values are identical for every metric, giving a range of zero for gases and a fixed point for particulates.

These numbers illustrate two practical points. First, the data are very fresh, with the latest timestamp less than three days old across all pollutants. Second, the spatial coverage is limited: only one station contributes to the entire city’s profile, so variations that might exist elsewhere in Kōchi are not captured. Consequently, while the current snapshot provides a clear, up‑to‑date measurement at that specific site, it does not reflect possible differences in air quality across other neighborhoods or over longer periods.

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 five valid measurements and is updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 22:00 UTC. These values provide a current snapshot of air quality across Kōchi, but conditions can differ by specific neighbourhoods and times of day, so local variations may not be captured in this summary.

OpenAQ station rows