Air quality in Casper, Wyoming, United States of America today

Mr. Duck’s Air Quality Score

Good air today for Casper, Wyoming, United States of America

⚠️ 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 Casper, Wyoming is currently rated as Good. The primary pollutant identified is PM2.5. Five valid measurements contribute to this assessment, with a reported PM2.5 concentration of 5.0 µg/m³. The reported PM2.5 level of 5.0 µg/m³ matches the reference value used for evaluation. These observations are drawn from recent local monitoring data.

PM10 data are not available for this reporting period, so the assessment relies solely on PM2.5 information. A total of five measurements were incorporated into the current summary. The dataset reflects conditions captured during the latest sampling interval. 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 Casper air‑quality feed draws from two monitoring stations and contains ten individual rows of data covering seven measured pollutants: nitrogen monoxide (NO), nitrogen dioxide (NO2), nitrogen oxides (NOX), ozone (O3), fine particulate matter (PM2.5), coarse particulate matter (PM10) and sulfur dioxide (SO2). Each pollutant is reported with a specific unit – ppm for the gases and µg/m³ for the particulates – and the dataset includes the most recent value recorded at each station.

Freshness varies across the set. Four rows were updated within the last 30 days, all of which belong to the gaseous measurements (NO2, O3, NO and NOX) with the latest timestamp of 2026‑02‑10 23:00 UTC. The remaining six rows are classified as “old”, with the latest PM2.5 reading from 2026‑01‑24 14:00 UTC and the PM10 and SO2 values dating back to 2018‑01‑24 18:00 UTC. No data were recorded today or within the past week, indicating that the current snapshot reflects conditions from several weeks to years ago rather than real‑time monitoring.

The numeric spread shows that the gaseous pollutants are all low in concentration and tightly clustered: NO2 ranges from 0.001 ppm to 0.002 ppm with a median of 0.0015 ppm, O3 is a constant 0.043 ppm, NO sits at 0.0015 ppm, and NOX at 0.0037 ppm. Particulate measurements are broader; PM2.5 varies between 2.0 µg/m³ and 5.0 µg/m³ with a median of 3.5 µg/m³, while PM10 is recorded at a single value of 6.0 µg/m³. The SO2 reading is also a single point at 0.001 ppm. Because half of the rows are older than a month and two pollutants rely on data from 2018, the available information captures only a limited slice of Casper’s air quality and may not reflect current conditions across the city.

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 set for Casper, Wyoming includes five valid measurements and is updated within 30 days, with the most recent reading recorded on 2026-02-10 at 23:00 UTC. These values reflect conditions at the time of sampling and are intended to give a general overview of citywide air quality. Keep in mind that air quality can vary by location and time within the city.

OpenAQ station rows