SmogRank / United States / Arizona / Tempe
Tempe, month by month
Tempe has a measured daily mean on 1,367 days since 1 January 2023. Its worst month was December 2024, at 59 US AQI (13.4 µg/m³), 569th of 2,616 cities on that month's world ranking. Its cleanest was March 2024, at 23 US AQI (4.1 µg/m³). 2025 averaged 39 US AQI (7.1 µg/m³), against 39 US AQI (7.1 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
Tempe's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| December 2024 | 5913.4 µg/m³ | 569thof 2,616 | South-western United States and Mexico, December 2024 to January 2025 |
| January 2025 | 5712.5 µg/m³ | 676thof 2,474 | South-western United States and Mexico, December 2024 to January 2025 |
| December 2023 | 5511.1 µg/m³ | 521stof 2,247 | Western United States and Mexico, December 2023 |
| August 2026 | 529.7 µg/m³ | 969thof 2,896 | – |
| January 2024 | 529.5 µg/m³ | 949thof 2,385 | – |
| January 2023 | 509.0 µg/m³ | 582ndof 1,261 | – |
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.
Tempe's worst days
| Day | US AQI | Episode |
|---|---|---|
| 1 Jan 2025 | 17284.9 µg/m³ | South-western United States and Mexico, December 2024 to January 2025 |
| 1 Jan 2023 | 12645.6 µg/m³ | – |
| 6 Aug 2026 | 11942.9 µg/m³ | – |
| 1 Jul 2025 | 10236.1 µg/m³ | – |
| 1 Jan 2024 | 9030.0 µg/m³ | – |
| 25 Dec 2023 | 9029.9 µg/m³ | Western United States and Mexico, December 2023 |
| 31 Dec 2024 | 8527.4 µg/m³ | South-western United States and Mexico, December 2024 to January 2025 |
| 23 Aug 2026 | 8225.5 µg/m³ | – |
| 10 Aug 2025 | 7723.3 µg/m³ | – |
| 23 Dec 2024 | 7622.7 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, Tempe, 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/tempe/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.
Tempe 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).