SmogRank / United States / Idaho / Weiser
Weiser, month by month
Weiser has a measured daily mean on 664 days since 29 March 2023. Its worst month was August 2026, at 83 US AQI (26.5 µg/m³), 145th of 2,896 cities on that month's world ranking. Its cleanest was June 2024, at 40 US AQI (7.2 µg/m³).
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
23 months
| Month | Why |
|---|---|
| Oct 2026 | 1 of 11 days measured; a month needs 8. The others: 10 with no readings from the monitor. |
| Jun 2026 | 18 of 30 days measured; a month needs 21. The others: 2 with no readings from the monitor, 10 with readings for part of the day (a day needs 18 hours). |
| Apr 2026 | 15 of 30 days measured; a month needs 21. The others: 4 with no readings from the monitor, 11 with readings for part of the day (a day needs 18 hours). |
| Mar 2026 | No day measured. The others: 30 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours). |
| Feb 2026 | No day measured. The others: 28 with no readings from the monitor. |
| Jan 2026 | No day measured. The others: 31 with no readings from the monitor. |
| Dec 2025 | No day measured. The others: 31 with no readings from the monitor. |
| Nov 2025 | No day measured. The others: 30 with no readings from the monitor. |
| Oct 2025 | 11 of 31 days measured; a month needs 22. The others: 17 with no readings from the monitor, 3 with readings for part of the day (a day needs 18 hours). |
| Jul 2025 | No day measured. The others: 31 with no readings from the monitor. |
| Jun 2025 | 5 of 30 days measured; a month needs 21. The others: 24 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours). |
| Mar 2025 | 4 of 31 days measured; a month needs 22. The others: 1 with readings for part of the day (a day needs 18 hours), 26 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Jan 2025 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Dec 2024 | No day measured. The others: 31 with no readings from the monitor. |
| Nov 2024 | No day measured. The others: 30 with no readings from the monitor. |
| Oct 2024 | 3 of 31 days measured; a month needs 22. The others: 27 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours). |
| Mar 2024 | 5 of 31 days measured; a month needs 22. The others: 24 with no readings from the monitor, 1 with readings for part of the day (a day needs 18 hours), 1 missing from OpenAQ's archive. |
| Feb 2024 | No day measured. The others: 28 with no readings from the monitor, 1 missing from OpenAQ's archive. |
| Jan 2024 | No day measured. The others: 31 with no readings from the monitor. |
| Dec 2023 | No day measured. The others: 31 with no readings from the monitor. |
| Nov 2023 | No day measured. The others: 30 with no readings from the monitor. |
| Mar 2023 | 3 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.
Weiser's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| August 2026 | 8326.5 µg/m³ | 145thof 2,896 | North-western United States and Canada, 4 to 22 August 2026 North-western United States and Canada, July and August 2026 |
| July 2026 | 8125.4 µg/m³ | 210thof 2,784 | North-western United States and Canada, July and August 2026 |
| July 2024 | 7421.5 µg/m³ | 92ndof 2,566 | North-western United States and Canada, July 2024 |
| August 2024 | 6717.6 µg/m³ | 129thof 2,010 | North-western United States, August and September 2024 Oregon, Idaho and Utah, United States, August 2024 |
| September 2024 | 6114.6 µg/m³ | 176thof 2,010 | North-western United States and Canada, 4 to 11 September 2024 North-western United States, August and September 2024 |
| September 2025 | 5511.2 µg/m³ | 537thof 3,104 | North-western United States and Canada, August and September 2025 |
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.
Weiser's worst days
Daily means, the highest since 29 Mar 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, Weiser, United States, 29 Mar 2023 – 1 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/weiser/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.
Weiser now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 17:07 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).