Air quality in Kawagoe, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Kawagoe, 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 Kawagoe is currently rated as Moderate. The primary pollutant identified is PM2.5, which represents fine particulate matter measured in the atmosphere.

Measurements show a PM2.5 concentration of 11.0 µg/m³ based on 23 valid observations recorded by OpenAQ. 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

Kawagoe’s OpenAQ feed currently 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). The dataset is built from five monitoring rows, each representing a distinct sensor location or reading series. Freshness varies by pollutant: the most recent CO value was recorded on 2026-02-09 01:00 UTC, while NO, NO2, NOX, PM2.5 and SO2 all have their latest updates on 2026-02-10 22:00 UTC, meaning that four of the six pollutants were refreshed within the last three days.

Across the five rows, CO is reported from a single station in Senba‑cho (0.2 ppm) with no variation – the minimum, median and maximum are all identical. NO shows very low concentrations ranging from 0.0 to 0.005 ppm, with a median of 0.001 ppm and a 10th–90th percentile spread of 0.0004‑0.0038 ppm. NO2 values sit between 0.004 and 0.01 ppm (median 0.005 ppm), while NOX spans 0.005‑0.011 ppm (median 0.007 ppm). PM2.5 exhibits the widest range, from 1 µg/m³ up to 11 µg/m³; the median is 3 µg/m³ and the inter‑percentile band runs from about 1.8 to 7.8 µg/m³. SO2 is at the detection limit, recorded as 0.0 ppm with a maximum of only 0.001 ppm (median 0.0005 ppm).

The coverage is uneven: CO and SO2 each come from just one or two rows, whereas NO, NO2, NOX and PM2.5 have five rows each, providing broader spatial sampling. Most timestamps are recent, but the single CO reading is older than three days, so short‑term changes in that pollutant may not be captured. Because sensor locations differ – for example, CO is measured in Senba‑cho while all other pollutants come from Takamatsu‑cho – conditions can vary across Kawagoe depending on where and when measurements were taken.

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 Kawagoe is based on 23 valid measurements and was refreshed recently, Updated within 3 days (last update: 2026‑02‑10T22:00:00+00:00). This snapshot reflects the conditions recorded at the time of sampling; air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in the city.

OpenAQ station rows