Air quality in Asahikawa, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Asahikawa, 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 Asahikawa is currently classified as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 15.0 µg/m³ based on 18 valid observations.

Data are shown via OpenAQ and reflect the latest available readings for the city. 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 Asahikawa contains measurements of six common air‑quality gases and particles – carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). In total 18 individual readings are recorded across four monitoring sites, but the coverage is uneven: CO and SO₂ each appear in only one row, while NO, NO₂, NOX and PM2.5 have four rows each.

All values were last updated on 2026‑02‑10 22:00 UTC, which falls within the “updated within three days” freshness window used by the source. This means the data reflects conditions from a single recent snapshot rather than an ongoing time series. For the pollutants with multiple rows, the observed concentrations span modest ranges. NO varies from 0.005 to 0.023 ppm with a median of 0.0115 ppm; NO₂ runs between 0.031 and 0.045 ppm (median 0.040 ppm); NOX is recorded from 0.04 up to 0.068 ppm (median 0.0495 ppm). PM2.5 values range from 6.0 to 15.0 µg/m³, centering around a median of 9.5 µg/m³. The single‑site readings for CO and SO₂ are both fixed at 0.4 ppm and 0.002 ppm respectively.

Because the dataset relies on a limited number of stations and captures only one recent moment, it cannot represent spatial or temporal variations that may exist across Asahikawa. Users should keep in mind that conditions can differ by neighbourhood and over time, and that the current snapshot provides a concise but narrow view of the city’s air quality.

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 dataset for Asahikawa includes 18 valid measurements and was refreshed recently, Updated within 3 days (last update: 2026‑02‑10T22:00:00+00:00). These values represent a snapshot of conditions at the time of collection; air quality can differ across neighborhoods and change throughout the day, so this information may not reflect the exact situation at any specific location or moment.

OpenAQ station rows