Air quality in Chikusei, Japan today
Mr. Duck’s Air Quality Score
Moderate air today for Chikusei, 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 Chikusei is currently classified as Moderate. The primary pollutant identified for today is PM2.5, which refers to fine particulate matter measured in the atmosphere.
Measurements show a PM2.5 concentration of 15.0 µg/m³ based on five valid observations collected through OpenAQ. This value reflects the level of fine particles present at the time of sampling and aligns with the category assessment provided.
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 data set for Chikusei contains measurements for five pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), total nitrogen oxides (NOX), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). All of these values come from a single monitoring location identified as 筑西市二木成615, so the city’s coverage in this snapshot is limited to one station row. The most recent reading for each pollutant was recorded on 2026-02-10 at 22:00 UTC, and every entry is flagged as having been updated within the past three days, indicating that the data are currently fresh.
Across the five pollutants the observed values are uniform with no variation in the sample period. NO registers a constant 0.001 ppm, NO₂ stays at 0.01 ppm, NOX at 0.011 ppm, and SO₂ is recorded as 0.0 ppm throughout. PM2.5 shows a single value of 15.0 µg/m³. Because each pollutant’s minimum, median, maximum, 10th percentile and 90th percentile are identical, the dataset does not reveal any spread or fluctuation in concentrations for this location during the reporting window.
The limited spatial coverage – only one monitoring site – means that conditions elsewhere in Chikusei may differ from what is shown here. While the timestamps are recent, the lack of multiple rows or older records prevents assessment of temporal trends or variability across the city. Users should keep in mind that this snapshot provides a narrow view of air quality at a specific point in time and place.
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 Chikusei is based on five valid measurements and was updated within 3 days, with the latest refresh recorded at 2026‑02‑10 22:00 UTC. This snapshot reflects conditions at a specific time and location; air quality can differ across neighborhoods and change throughout the day, so values may not represent current or citywide conditions.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| 筑西市二木成615 | no | 0.001 | ppm | 2026-02-10 22:00 UTC |
| 筑西市二木成615 | no2 | 0.01 | ppm | 2026-02-10 22:00 UTC |
| 筑西市二木成615 | nox | 0.011 | ppm | 2026-02-10 22:00 UTC |
| 筑西市二木成615 | pm25 | 15.0 | µg/m³ | 2026-02-10 22:00 UTC |
| 筑西市二木成615 | so2 | 0.0 | ppm | 2026-02-10 22:00 UTC |