SmogRank / United States / California / Yuba City
Yuba City, month by month
Yuba City has a measured daily mean on 1,306 days since 1 January 2023. Its worst month was January 2026, at 60 US AQI (13.7 µg/m³), 828th of 2,617 cities on that month's world ranking. Its cleanest was March 2023, at 21 US AQI (3.7 µg/m³). 2025 averaged 39 US AQI (7.0 µg/m³), against 42 US AQI (7.5 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 |
|---|---|
| Jun 2026 | 20 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Nov 2025 | 15 of 30 days measured; a month needs 21. The others: 15 with under 18 hours of readings or readings that failed our checks. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Yuba City's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2026 | 6013.7 µg/m³ | 828thof 2,617 | California and Oregon, United States, January 2026 |
| December 2023 | 5812.7 µg/m³ | 379thof 2,247 | California and Oregon, United States, December 2023 |
| January 2025 | 5712.5 µg/m³ | 676thof 2,474 | California, United States, January 2025 |
| July 2024 | 5712.1 µg/m³ | 417thof 2,566 | California and Nevada, United States, July 2024 |
| August 2023 | 5611.8 µg/m³ | 367thof 1,980 | North-western United States and Canada, August 2023 |
| December 2024 | 5611.7 µg/m³ | 700thof 2,616 | California and Oregon, United States, December 2024 |
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.
Yuba City's worst days
| Day | US AQI | Episode |
|---|---|---|
| 5 Jul 2024 | 11741.9 µg/m³ | California and Nevada, United States, July 2024 |
| 4 Jul 2024 | 10537.2 µg/m³ | California and Nevada, United States, July 2024 |
| 30 Aug 2023 | 9130.8 µg/m³ | North-western United States and Canada, August 2023 |
| 20 Sept 2023 | 9130.4 µg/m³ | California and Oregon, United States, September 2023 |
| 16 Dec 2023 | 8627.7 µg/m³ | California and Oregon, United States, December 2023 |
| 22 Sept 2023 | 8426.9 µg/m³ | California and Oregon, United States, September 2023 |
| 7 Dec 2024 | 8326.3 µg/m³ | California and Oregon, United States, December 2024 |
| 18 Jan 2025 | 8326.3 µg/m³ | California, United States, January 2025 |
| 19 Jan 2025 | 8225.8 µg/m³ | California, United States, January 2025 |
| 14 Jan 2026 | 8225.7 µg/m³ | California and Oregon, United States, January 2026 |
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, Yuba City, 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/yuba-city/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.
Yuba City now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-13 02:07 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).