Air quality in Clay County, Missouri, United States of America today
Mr. Duck’s Air Quality Score
Good air today for Clay County, Missouri, United States of America
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Clay County, Missouri is rated as Good today. The primary pollutant identified is PM2.5 (fine particles).
A single valid measurement recorded a PM2.5 concentration of 3.5 µg/m³. No PM10 data are available for this assessment. This reflects the only observation used to determine the current rating.
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 air‑quality record for Clay County, Missouri draws on two sensor rows supplied through OpenAQ. Both ozone (O3) and fine particulate matter (PM2.5) are represented, but the coverage is limited to a single monitoring location in Liberty. For ozone the most recent reading was recorded on 2025‑11‑04 15:00 UTC, showing a uniform value of 0.02 ppm across the dataset; the minimum, median and maximum are all identical at 0.02 ppm, with the 10th and 90th percentiles matching that figure as well. The PM2.5 data are slightly more recent, last updated on 2026‑02‑10 23:00 UTC, and likewise present a single consistent measurement of 3.5 µg/m³ for every statistical summary.
Overall freshness shows one row refreshed within the past week and another classified as “old,” meaning its timestamp falls outside the most recent seven‑day window. No data points are from today, the last three days, or the last thirty days beyond those two entries. Because each pollutant is captured by only one sensor, there is no spread of values to illustrate variability across different parts of the county; the recorded range for both ozone and PM2.5 collapses to a single point.
Consequently, while the dataset does provide concrete numbers for O3 and PM2.5 at Liberty, it offers limited insight into broader spatial or temporal patterns within Clay County. Users should keep in mind that conditions can differ across neighborhoods and times not covered by these two recent but isolated measurements.
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 current air‑quality data for Clay County, Missouri reflects a single valid measurement and is updated within 3 days, with the latest reading recorded on 2026‑02‑10 at 23:00 UTC. This snapshot provides an overview of conditions at that moment; however, pollutant levels can differ across neighborhoods and change throughout the day, so actual exposure may vary locally and temporally.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Liberty | o3 | 0.02 | ppm | 2025-11-04 15:00 UTC |
| Liberty | pm25 | 3.5 | µg/m³ | 2026-02-10 23:00 UTC |