Air quality in Kumagaya, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Kumagaya, 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 Kumagaya today falls into the Moderate category according to OpenAQ data. The primary pollutant identified is PM2.5 (fine particles), with a measured concentration of 10.0 µg/m³. Fifteen valid measurements contributed to this assessment.

Overall, the conditions reflect a moderate level of particulate matter without additional pollutants reported. 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 Kumagaya includes six measured pollutants – carbon monoxide (CO), nitrogen oxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). Data come from three monitoring stations, contributing a total of fifteen individual rows across the different gases. All values were recorded at the same moment, 2026‑02‑10 22:00 UTC, so the information is fresh, having been updated within the last three days for every pollutant.

Across the city the observed concentrations show modest variation. For NO the readings range from a low of 0.001 ppm to a high of 0.008 ppm, with a median of 0.001 ppm; NO₂ spans 0.014‑0.020 ppm (median 0.016 ppm); and NOX varies between 0.015‑0.028 ppm (median 0.017 ppm). PM2.5 values are between 7 µg/m³ and 10 µg/m³, with a median of 8 µg/m³, indicating that the particulate levels stay within a narrow band during the measurement period. CO is recorded at three sites, ranging from 0.2‑0.3 ppm (median 0.25 ppm), while SO₂ was not detected at any station, with all rows reporting 0 ppm.

The coverage is uneven: NO, NO₂ and NOX each have three recent rows, PM2.5 also has three, but CO is represented by only two rows and SO₂ by a single row. Consequently, the dataset provides a solid snapshot for most gases but offers limited depth for carbon monoxide and no variability information for sulfur dioxide. Because the data reflect a single timestamp, conditions in Kumagaya can still differ across neighborhoods or at other times of day, so this snapshot should be viewed as one momentary picture rather than a complete description of daily 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 data shown reflects 15 valid measurements and is Updated within 3 days, with the most recent reading recorded at 2026‑02‑10T22:00:00+00:00. This snapshot provides a brief overview of current conditions; however, air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in Kumagaya.

OpenAQ station rows