Air quality in Cascade County, Montana, United States of America today

Mr. Duck’s Air Quality Score

Good air today for Cascade County, Montana, 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 Cascade County, Montana is classified as Good. The primary pollutant measured is PM2.5 (fine particles). The latest reading shows a PM2.5 concentration of 0.051 µg/m³ (rounded). This concentration aligns with the Good category criteria. Five valid measurements contributed to this assessment. No PM10 data were reported for this period. All values are expressed in micrograms per cubic meter.

Data is shown via OpenAQ. These observations reflect the current atmospheric conditions captured by the monitoring network. The dataset includes timestamps for each measurement, recorded in UTC. 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 Cascade County air‑quality feed draws from two monitoring stations that together contribute twelve recent data rows. Six of those rows lack a clear timestamp, one is classified as old, and the remaining five were recorded within the last 30 days, giving a mixed picture of timeliness. All six measured pollutants appear in the feed: PM1, PM10, PM2.5, relative humidity, temperature and UM003 (particle count). The most up‑to‑date observations—PM1, PM2.5, relative humidity, temperature and UM003—were all logged on 2026‑02‑01 at 10:00 UTC, while the PM10 record dates back to 2025‑01‑13 at 23:00 UTC, indicating that PM10 data are considerably less current than the other parameters.

Across the recent entries, PM1 values are extremely low, ranging from 0.0 to 0.0014 µg/m³ with a median of about 0.0007 µg/m³. PM10 shows a broader spread, from 0.0 up to 5.433 µg/m³ and a median near 2.72 µg/m³, but its single older timestamp limits confidence in current conditions. PM2.5 measurements sit between 0.051 and 1.771 µg/m³, with a median of roughly 0.91 µg/m³, illustrating modest variability. Relative humidity in the city varies from 39.70 % to 46.54 % (median 43.12 %), while temperature ranges from 11.27 °C to 17.19 °C (median 14.23 °C). Particle concentration (UM003) spans 114.26 to 795.52 particles/cm³, centering around a median of 454.89 particles/cm³. The uneven freshness—especially the older PM10 record—and the presence of unknown timestamps mean that the snapshot may not capture the full spatial and temporal diversity of air quality across Cascade County at any given moment.

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

This report is based on five valid measurements and was updated within 30 days. The data were last refreshed on 2026-02-01T10:00:00+00:00. Air quality can vary by location and time within Cascade County, so this snapshot may not represent conditions everywhere in the city.

OpenAQ station rows