SmogRank / United States / Arizona / Green Valley
Green Valley, month by month
Green Valley has a measured daily mean on 1,283 days since 1 January 2023. Its worst month was January 2025, at 29 US AQI (5.3 µg/m³), 2,175th of 2,474 cities on that month's world ranking. Its cleanest was September 2025, at 12 US AQI (2.1 µg/m³). 2025 averaged 22 US AQI (3.9 µg/m³), against 18 US AQI (3.3 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
Months without a mean, and why
2 months
| Month | Why |
|---|---|
| Mar 2023 | 10 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 1 with under 18 hours of readings or readings that failed our checks. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Green Valley's worst months
| Month | US AQI | World rank |
|---|---|---|
| January 2025 | 295.3 µg/m³ | 2,175thof 2,474 |
| July 2025 | 285.0 µg/m³ | 2,611thof 2,889 |
| July 2023 | 274.9 µg/m³ | 1,249thof 1,432 |
| April 2023 | 264.7 µg/m³ | 1,393rdof 1,622 |
| August 2025 | 264.7 µg/m³ | 2,747thof 2,901 |
| May 2025 | 264.6 µg/m³ | 2,431stof 2,826 |
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.
Green Valley's worst days
| Day | US AQI |
|---|---|
| 8 Jan 2025 | 8527.5 µg/m³ |
| 28 Mar 2026 | 6818.2 µg/m³ |
| 4 Apr 2023 | 6416.0 µg/m³ |
| 23 Aug 2025 | 6214.8 µg/m³ |
| 28 Jun 2023 | 6013.9 µg/m³ |
| 29 Jun 2023 | 5813.0 µg/m³ |
| 12 May 2025 | 5812.9 µg/m³ |
| 1 Jul 2025 | 5812.8 µg/m³ |
| 29 Mar 2026 | 5511.1 µg/m³ |
| 26 Jun 2023 | 5310.3 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, Green Valley, 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/green-valley/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.
Green Valley now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 21:07 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).