SmogRank / United States / Nevada / Spring Valley
Spring Valley, month by month
Spring Valley has a measured daily mean on 1,368 days since 1 January 2023. Its worst month was July 2024, at 46 US AQI (8.3 µg/m³), 1,233rd of 2,566 cities on that month's world ranking. Its cleanest was April 2026, at 17 US AQI (3.1 µg/m³). 2025 averaged 28 US AQI (5.1 µg/m³), against 29 US AQI (5.3 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
Spring Valley's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2024 | 468.3 µg/m³ | 1,233rdof 2,566 | – |
| September 2024 | 468.3 µg/m³ | 757thof 2,010 | Nevada and Utah, United States, September 2024 |
| August 2025 | 468.2 µg/m³ | 1,750thof 2,901 | – |
| December 2025 | 386.8 µg/m³ | 2,203rdof 3,006 | – |
| June 2024 | 366.4 µg/m³ | 1,911thof 2,563 | – |
| January 2026 | 356.3 µg/m³ | 2,028thof 2,617 | – |
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.
Spring Valley's worst days
| Day | US AQI | Episode |
|---|---|---|
| 11 Sept 2024 | 12143.5 µg/m³ | Nevada and Utah, United States, September 2024 |
| 27 Jul 2024 | 9934.7 µg/m³ | – |
| 16 Jun 2024 | 9633.0 µg/m³ | – |
| 21 Feb 2023 | 8024.5 µg/m³ | – |
| 12 Sept 2024 | 7421.4 µg/m³ | – |
| 6 Sept 2024 | 7320.7 µg/m³ | – |
| 5 Sept 2024 | 7019.4 µg/m³ | – |
| 4 Aug 2025 | 7019.2 µg/m³ | – |
| 3 Aug 2025 | 6818.1 µg/m³ | – |
| 31 Jul 2023 | 6717.9 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, Spring 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/spring-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.
Spring Valley 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).