SmogRank / United States / Arizona / Phoenix
Phoenix, month by month
Phoenix has a measured daily mean on 1,372 days since 1 January 2023. Its worst month was December 2024, at 75 US AQI (22.0 µg/m³), 194th of 2,616 cities on that month's world ranking. Its cleanest was September 2026, at 27 US AQI (4.8 µg/m³). 2025 averaged 52 US AQI (9.6 µg/m³), against 52 US AQI (9.6 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
Phoenix's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| December 2024 | 7522.0 µg/m³ | 194thof 2,616 | South-western United States and Mexico, December 2024 to January 2025 |
| January 2025 | 7220.5 µg/m³ | 287thof 2,474 | Western United States and Mexico, January and February 2025 South-western United States and Mexico, December 2024 to January 2025 |
| December 2023 | 7019.3 µg/m³ | 172ndof 2,247 | Western United States and Mexico, December 2023 |
| January 2024 | 6516.5 µg/m³ | 383rdof 2,385 | – |
| December 2025 | 6315.4 µg/m³ | 710thof 3,006 | – |
| November 2024 | 6114.6 µg/m³ | 430thof 2,624 | – |
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.
Phoenix's worst days
| Day | US AQI | Episode |
|---|---|---|
| 1 Jan 2025 | 242167.0 µg/m³ | South-western United States and Mexico, December 2024 to January 2025 |
| 1 Jan 2024 | 184103.0 µg/m³ | – |
| 25 Dec 2023 | 16271.0 µg/m³ | Western United States and Mexico, December 2023 |
| 31 Dec 2024 | 12545.3 µg/m³ | South-western United States and Mexico, December 2024 to January 2025 |
| 5 Jul 2026 | 11340.4 µg/m³ | – |
| 24 Dec 2023 | 9834.1 µg/m³ | Western United States and Mexico, December 2023 |
| 1 Jul 2025 | 9734.0 µg/m³ | – |
| 7 Jan 2023 | 9633.0 µg/m³ | – |
| 22 Dec 2024 | 9331.6 µg/m³ | – |
| 25 Dec 2024 | 9231.3 µg/m³ | – |
Daily means, the highest since 1 Jan 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, Phoenix, United States, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/phoenix/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.
Phoenix 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).