SmogRank / United States / California / Ojai
Ojai, month by month
Ojai has a measured daily mean on 1,254 days since 12 April 2023. Its worst month was August 2025, at 52 US AQI (9.9 µg/m³), 1,254th of 2,901 cities on that month's world ranking. Its cleanest was March 2025, at 17 US AQI (3.1 µg/m³). 2025 averaged 31 US AQI (5.6 µg/m³), against 30 US AQI (5.4 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
1 month
| Month | Why |
|---|---|
| Apr 2023 | 16 of 30 days measured; a month needs 21. The others: 3 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Ojai's worst months
| Month | US AQI | World rank |
|---|---|---|
| August 2025 | 529.9 µg/m³ | 1,254thof 2,901 |
| September 2023 | 488.6 µg/m³ | 899thof 2,176 |
| June 2024 | 407.2 µg/m³ | 1,624thof 2,563 |
| July 2026 | 397.1 µg/m³ | 2,127thof 2,784 |
| May 2025 | 386.8 µg/m³ | 1,671stof 2,826 |
| August 2026 | 386.8 µg/m³ | 2,174thof 2,896 |
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.
Ojai's worst days
| Day | US AQI |
|---|---|
| 23 Sept 2023 | 7320.8 µg/m³ |
| 22 Jan 2025 | 6818.4 µg/m³ |
| 5 Aug 2025 | 6717.5 µg/m³ |
| 4 Aug 2025 | 6617.3 µg/m³ |
| 21 Sept 2023 | 6416.3 µg/m³ |
| 24 Sept 2023 | 6416.3 µg/m³ |
| 22 Sept 2023 | 6416.0 µg/m³ |
| 8 Aug 2025 | 6416.0 µg/m³ |
| 6 Aug 2025 | 6315.6 µg/m³ |
| 10 Jul 2024 | 6013.8 µg/m³ |
Daily means, the highest since 12 Apr 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, Ojai, United States, 12 Apr 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/ojai/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.
Ojai now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 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).