SmogRank / United States / Nevada / Reno
Reno, month by month
Reno has a measured daily mean on 1,360 days since 1 January 2023. Its worst month was January 2026, at 55 US AQI (11.3 µg/m³), 968th of 2,617 cities on that month's world ranking. Its cleanest was March 2023, at 19 US AQI (3.5 µg/m³). 2025 averaged 39 US AQI (7.0 µg/m³), against 34 US AQI (6.1 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
Reno's worst months
| Month | US AQI | World rank |
|---|---|---|
| January 2026 | 5511.3 µg/m³ | 968thof 2,617 |
| December 2025 | 5310.2 µg/m³ | 1,287thof 3,006 |
| January 2025 | 529.9 µg/m³ | 1,012thof 2,474 |
| November 2025 | 529.7 µg/m³ | 1,094thof 2,715 |
| December 2023 | 529.5 µg/m³ | 824thof 2,247 |
| December 2024 | 529.4 µg/m³ | 982ndof 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.
Reno's worst days
| Day | US AQI |
|---|---|
| 12 Aug 2024 | 7924.1 µg/m³ |
| 27 Nov 2025 | 7723.1 µg/m³ |
| 31 Jul 2024 | 7722.8 µg/m³ |
| 1 Aug 2024 | 7722.8 µg/m³ |
| 15 Dec 2025 | 7220.2 µg/m³ |
| 20 Dec 2024 | 7120.0 µg/m³ |
| 10 Dec 2023 | 7019.3 µg/m³ |
| 17 Dec 2023 | 6919.0 µg/m³ |
| 8 Nov 2024 | 6918.9 µg/m³ |
| 19 Dec 2024 | 6918.8 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, Reno, 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/reno/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.
Reno now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 17:07 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).