SmogRank / United States / California / Alpine
Alpine, month by month
Alpine has a measured daily mean on 1,248 days since 7 May 2023. Its worst month was August 2025, at 54 US AQI (10.5 µg/m³), 1,131st of 2,901 cities on that month's world ranking. Its cleanest was January 2026, at 17 US AQI (3.1 µg/m³). 2025 averaged 35 US AQI (6.3 µg/m³), against 37 US AQI (6.7 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
Alpine's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| August 2025 | 5410.5 µg/m³ | 1,131stof 2,901 | California and Nevada, United States, August 2025 |
| June 2024 | 5310.4 µg/m³ | 573rdof 2,563 | – |
| July 2024 | 5310.2 µg/m³ | 687thof 2,566 | – |
| June 2025 | 5310.1 µg/m³ | 1,264thof 2,508 | – |
| May 2024 | 529.7 µg/m³ | 813thof 2,684 | – |
| May 2023 | 529.4 µg/m³ | 561stof 1,600 | – |
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.
Alpine's worst days
| Day | US AQI | Episode |
|---|---|---|
| 25 Jan 2025 | 9030.1 µg/m³ | – |
| 19 Jun 2025 | 8829.2 µg/m³ | – |
| 5 Aug 2025 | 8628.0 µg/m³ | California and Nevada, United States, August 2025 |
| 7 Jul 2026 | 8427.0 µg/m³ | – |
| 18 Jun 2025 | 7823.5 µg/m³ | – |
| 7 Aug 2025 | 7723.2 µg/m³ | – |
| 4 Aug 2025 | 7421.5 µg/m³ | California and Nevada, United States, August 2025 |
| 17 May 2026 | 7220.3 µg/m³ | – |
| 10 Jul 2024 | 6919.0 µg/m³ | – |
| 16 Jun 2026 | 6818.0 µg/m³ | – |
Daily means, the highest since 7 May 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, Alpine, United States, 7 May 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/alpine/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.
Alpine 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).