SmogRank / United States / Nevada / Henderson
Henderson, month by month
Henderson has a measured daily mean on 1,369 days since 1 January 2023. Its worst month was September 2024, at 52 US AQI (9.7 µg/m³), 489th of 2,010 cities on that month's world ranking. Its cleanest was March 2024, at 17 US AQI (3.0 µg/m³). 2025 averaged 27 US AQI (4.9 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
Henderson's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| September 2024 | 529.7 µg/m³ | 489thof 2,010 | Nevada and Utah, United States, September 2024 |
| July 2024 | 437.7 µg/m³ | 1,459thof 2,566 | – |
| August 2025 | 427.6 µg/m³ | 1,940thof 2,901 | California and Nevada, United States, August 2025 |
| July 2023 | 366.5 µg/m³ | 1,028thof 1,432 | – |
| October 2024 | 366.4 µg/m³ | 1,342ndof 2,020 | – |
| December 2024 | 366.4 µg/m³ | 1,931stof 2,616 | – |
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.
Henderson's worst days
| Day | US AQI | Episode |
|---|---|---|
| 11 Sept 2024 | 16271.4 µg/m³ | Nevada and Utah, United States, September 2024 |
| 16 Jun 2024 | 8829.2 µg/m³ | – |
| 4 Aug 2025 | 8728.3 µg/m³ | California and Nevada, United States, August 2025 |
| 5 Sept 2024 | 7924.0 µg/m³ | – |
| 12 Sept 2024 | 7823.7 µg/m³ | – |
| 4 Jul 2024 | 7823.5 µg/m³ | – |
| 27 Jul 2024 | 7823.5 µg/m³ | – |
| 31 Jul 2023 | 7421.6 µg/m³ | – |
| 6 Sept 2024 | 7321.0 µg/m³ | – |
| 21 Feb 2023 | 6918.5 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, Henderson, 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/henderson/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.
Henderson 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).