SmogRank / United States / Montana / Glendive
Glendive, month by month
Glendive has a measured daily mean on 1,017 days since 19 October 2023. Its worst month was July 2026, at 57 US AQI (12.5 µg/m³), 811th of 2,784 cities on that month's world ranking. Its cleanest was January 2025, at 13 US AQI (2.4 µg/m³). 2025 averaged 31 US AQI (5.5 µg/m³), against 29 US AQI (5.2 µg/m³) in 2024.
Every month since 2023
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Months without a mean, and why
4 months
| Month | Why |
|---|---|
| Oct 2026 | 7 of 11 days measured; a month needs 8. The others: 4 with readings for part of the day (a day needs 18 hours). |
| Nov 2025 | 11 of 30 days measured; a month needs 21. The others: 12 with no readings from the monitor, 7 with readings for part of the day (a day needs 18 hours). |
| Feb 2025 | 18 of 28 days measured; a month needs 20. The others: 10 with no readings from the monitor. |
| Oct 2023 | 13 of 31 days measured; a month needs 22. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Glendive's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 5712.5 µg/m³ | 811thof 2,784 | North-western United States and Canada, July and August 2026 |
| August 2026 | 5611.6 µg/m³ | 614thof 2,896 | North-western United States and Canada, July and August 2026 |
| July 2024 | 5511.2 µg/m³ | 540thof 2,566 | North-western United States and Canada, July 2024 |
| June 2025 | 5310.4 µg/m³ | 1,179thof 2,508 | North-western Canada and United States, June 2025 |
| July 2025 | 519.2 µg/m³ | 1,469thof 2,889 | – |
| August 2024 | 478.5 µg/m³ | 1,041stof 2,010 | North-western Canada and United States, August 2024 |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Glendive's worst days
Daily means, the highest since 19 Oct 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Glendive, United States, 19 Oct 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/glendive/history (accessed 12 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Glendive now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 18:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).