Air quality in Himeji, Japan today

Mr. Duck’s Air Quality Score

Moderate air today for Himeji, 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 Himeji today falls into the Moderate category according to OpenAQ data. The primary pollutant identified is PM2.5 (fine particles), with a measured concentration of 23.0 µg/m³ based on 35 valid observations.

No other pollutants reached reporting thresholds, and the available measurements reflect current conditions across 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 Himeji air‑quality feed currently provides data on six 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 contains 35 individual measurement rows drawn from seven monitoring stations across the city. Freshness varies by pollutant: the most recent reading for each is timestamped 2026‑02‑10 22:00 UTC, so the newest data are all less than three days old. However, the number of rows differs markedly; CO is represented by only two rows and SO₂ by five, whereas NO, NO₂, NOX and PM₂.5 each have seven rows.

Across the recent sample, concentrations show modest spreads. For nitrogen oxides the median values sit at 0.001 ppm for NO, 0.012 ppm for NO₂ and 0.015 ppm for NOX, with maximums ranging from 0.006 ppm (NO) to 0.025 ppm (NOX). PM₂.5 levels are centred around a median of 13 µg/m³, with observed values between 10 µg/m³ and 23 µg/m³. Sulfur dioxide is essentially absent in the latest data, recorded at 0.0 ppm across its five rows. Carbon monoxide shows higher variability, with a median of 0.30 ppm and readings spanning from 0.20 ppm up to 0.40 ppm.

These figures illustrate that while most pollutants have consistent coverage across seven stations, CO and SO₂ are monitored at fewer sites, which can limit the spatial resolution for those gases. Because the dataset reflects a snapshot from early February, conditions elsewhere in the city or at other times may differ.

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 dataset for Himeji includes 35 valid measurements and is Updated within 3 days, with the most recent data recorded on 2026‑02‑10 at 22:00 UTC. While these figures reflect the overall city conditions at that time, air quality can differ across neighborhoods and change throughout the day, so this snapshot may not represent every location or moment in Himeji.

OpenAQ station rows