SmogRank / United States / Nevada / Las Vegas
Las Vegas, month by month
Las Vegas has a measured daily mean on 1,369 days since 1 January 2023. Its worst month was December 2025, at 64 US AQI (16.2 µg/m³), 677th of 3,006 cities on that month's world ranking. Its cleanest was September 2026, at 22 US AQI (3.9 µg/m³). 2025 averaged 42 US AQI (7.6 µg/m³), against 44 US AQI (7.9 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
Las Vegas's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| December 2025 | 6416.2 µg/m³ | 677thof 3,006 | Western United States and Mexico, December 2025 |
| December 2023 | 6114.4 µg/m³ | 301stof 2,247 | Western United States and Mexico, December 2023 |
| December 2024 | 6114.4 µg/m³ | 504thof 2,616 | South-western United States and Mexico, December 2024 to January 2025 |
| January 2026 | 5812.6 µg/m³ | 903rdof 2,617 | – |
| January 2024 | 5511.2 µg/m³ | 775thof 2,385 | California and Nevada, United States, January 2024 |
| January 2025 | 5410.8 µg/m³ | 869thof 2,474 | South-western United States and Mexico, December 2024 to January 2025 |
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.
Las Vegas's worst days
| Day | US AQI | Episode |
|---|---|---|
| 11 Sept 2024 | 14051.4 µg/m³ | Nevada and Utah, United States, September 2024 |
| 27 Jul 2024 | 11139.7 µg/m³ | – |
| 16 Jun 2024 | 10938.6 µg/m³ | – |
| 4 Jul 2024 | 9331.4 µg/m³ | California and Nevada, United States, July 2024 |
| 7 Dec 2025 | 9029.9 µg/m³ | – |
| 21 Feb 2023 | 8929.6 µg/m³ | – |
| 1 Jan 2024 | 8929.4 µg/m³ | – |
| 25 Dec 2023 | 8728.5 µg/m³ | Western United States and Mexico, December 2023 |
| 14 Dec 2025 | 8627.7 µg/m³ | Western United States and Mexico, December 2025 |
| 15 Jan 2024 | 8527.5 µg/m³ | California and Nevada, United States, January 2024 |
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, Las Vegas, 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/las-vegas/history (accessed 13 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.
Las Vegas now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 00:07 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).