Air quality in Ichikawa, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Ichikawa, 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 today in Ichikawa is rated as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 21.0 µg/m³ based on twenty valid observations collected via OpenAQ.

These data reflect the current assessment for the city without additional interpretation. 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 city’s open‑air quality feed includes six measured 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). Data come from four monitoring stations, providing a total of twenty individual rows across the pollutants. The most recent readings for every pollutant were recorded on 2026‑02‑10 at 22:00 UTC, which means all values are less than three days old and reflect current conditions.

Across the four stations that report NO, NO₂ and NOX, concentrations range from a low of 0.005 ppm for NO up to a high of 0.048 ppm for NOX, with median values clustered tightly around 0.0085 ppm (NO), 0.034 ppm (NO₂) and 0.0425 ppm (NOX). PM2.5 measurements show a broader spread: the smallest observed value is 12 µg/m³, the largest 21 µg/m³, and the median sits at 13 µg/m³, while the 10th‑percentile and 90th‑percentile values are 12 µg/m³ and 18.9 µg/m³ respectively. In contrast, CO and SO₂ are reported from only two stations each; CO is consistently recorded at 0.4 ppm, and SO₂ ranges from zero to a maximum of 0.001 ppm with a median of 0.0005 ppm.

Because the sensor network does not cover every pollutant uniformly – four stations contribute data for the nitrogen oxides and PM2.5, but only two provide CO and SO₂ – the dataset offers richer detail for some compounds than others. Nonetheless, all available rows are recent, so the figures give a timely snapshot of Ichikawa’s air composition, while acknowledging that local conditions can still differ by neighbourhood and time of day.

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 20 valid measurements and is Updated within 3 days, with the latest values recorded at 2026‑02‑10T22:00:00+00:00. While these figures provide a current overview of Ichikawa’s air quality, conditions can differ across neighborhoods and shift throughout the day, so this snapshot may not represent every location or moment within the city.

OpenAQ station rows