SmogRank / United States / California / Poway
Poway, month by month
Poway has a measured daily mean on 1,181 days since 7 July 2023. Its worst month was August 2025, at 55 US AQI (11.0 µg/m³), 1,001st of 2,901 cities on that month's world ranking. Its cleanest was January 2026, at 27 US AQI (4.8 µg/m³). 2025 averaged 46 US AQI (8.3 µg/m³), against 43 US AQI (7.8 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
Poway's worst months
| Month | US AQI | World rank |
|---|---|---|
| August 2025 | 5511.0 µg/m³ | 1,001stof 2,901 |
| September 2023 | 5410.6 µg/m³ | 491stof 2,176 |
| June 2025 | 5310.4 µg/m³ | 1,179thof 2,508 |
| June 2024 | 5310.2 µg/m³ | 601stof 2,563 |
| August 2024 | 5310.0 µg/m³ | 610thof 2,010 |
| July 2023 | 529.9 µg/m³ | 674thof 1,432 |
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.
Poway's worst days
| Day | US AQI | Episode |
|---|---|---|
| 17 May 2026 | 8627.9 µg/m³ | California, United States, May 2026 |
| 23 Sept 2023 | 7723.2 µg/m³ | – |
| 24 Sept 2023 | 7521.8 µg/m³ | – |
| 5 Dec 2024 | 7421.4 µg/m³ | – |
| 1 Jan 2025 | 7320.8 µg/m³ | – |
| 25 Sept 2023 | 7220.4 µg/m³ | – |
| 16 Jun 2024 | 7019.5 µg/m³ | – |
| 13 Dec 2025 | 7019.3 µg/m³ | – |
| 7 Sept 2024 | 6918.5 µg/m³ | – |
| 20 May 2026 | 6918.5 µg/m³ | – |
Daily means, the highest since 7 Jul 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, Poway, United States, 7 Jul 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/poway/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.
Poway 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).