Air quality in Iruma, Japan today
Mr. Duck’s Air Quality Score
Good air today for Iruma, Japan
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Iruma is classified as Good today. The primary pollutant identified is PM2.5, which refers to fine particulate matter measured in the atmosphere.
Measurements from five valid observations show a PM2.5 concentration of 8.0 µg/m³. No PM10 value is available for this assessment. Data is shown via 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
The dataset for Iruma includes measurements of five pollutants—nitric oxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂)—collected from ten individual rows that originate at two monitoring stations. The most recent readings are all from 10 February 2026, with the gas‑phase pollutants (NO, NO₂, NOX) last updated at 13:00 UTC and the particulate and sulfur measurements refreshed later that day at 22:00 UTC, meaning every pollutant has a timestamp within the past week.
Across the ten rows, the observed concentrations show modest variability. For the nitrogen oxides, values range from a low of 0.000 ppm for NO up to 0.030 ppm for NOX, with median levels around 0.001–0.018 ppm and the 10th‑percentile near zero for NO but about 0.008 ppm for NO₂ and NOX. PM2.5 spans 8.0 to 15.0 µg/m³, a median of 11.5 µg/m³ and a tighter interquartile spread (approximately 8.7–14.3 µg/m³). Sulfur dioxide registers uniformly at 0.0 ppm in all rows, indicating no detectable SO₂ during the sampling period.
The data set is relatively fresh overall, with every pollutant having at least one measurement recorded within the last three to seven days. However, coverage is uneven: while nitrogen oxide species are reported from both stations, PM2.5 and SO₂ appear only in the most recent rows, suggesting fewer recent samples for particulates compared with gases. Because the dataset comprises a limited number of stations, conditions can differ across neighborhoods and times not captured by these snapshots.
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 reflect five valid measurements and are updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 22:00 UTC. While this snapshot provides a current view of Iruma’s air quality, conditions can differ across neighborhoods and change throughout the day, so local variations may exist beyond what is displayed here.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| 入間市東町１-１６ | no | 0.0 | ppm | 2024-12-18 13:00 UTC |
| 入間市東町１-１６ | no2 | 0.006 | ppm | 2024-12-18 13:00 UTC |
| 入間市東町１-１６ | nox | 0.006 | ppm | 2024-12-18 13:00 UTC |
| 入間市東町１-１６ | pm25 | 15.0 | µg/m³ | 2024-12-16 06:00 UTC |
| 入間市東町１-１６ | so2 | 0.0 | ppm | 2024-12-18 13:00 UTC |
| 入間市豊岡4-2-1 | no | 0.002 | ppm | 2026-02-10 13:00 UTC |
| 入間市豊岡4-2-1 | no2 | 0.028 | ppm | 2026-02-10 13:00 UTC |
| 入間市豊岡4-2-1 | nox | 0.03 | ppm | 2026-02-10 13:00 UTC |
| 入間市豊岡4-2-1 | pm25 | 8.0 | µg/m³ | 2026-02-10 22:00 UTC |
| 入間市豊岡4-2-1 | so2 | 0.0 | ppm | 2026-02-10 22:00 UTC |