Long Beach Air Quality in Fall
Across 2019–2025, Long Beach's fall (September–November) air quality had a median AQI of 80 (Moderate) over 637 monitored days in the Los Angeles-Long Beach-Anaheim, CA area. 29.4% of fall days (187 of 637) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 48.2% of days. The cleanest fall on record here was 2025 (median AQI 67, 9 days above 100) and the worst was 2020 (median 119, 52 days above 100, peak AQI 235).
- Good: 5.0%
- Moderate: 65.6%
- Unhealthy for Sensitive Groups: 18.7%
- Unhealthy or worse: 10.7%
Improve Indoor Air Quality
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How is the air in Long Beach in fall?
Moderate on a typical day: median AQI 80 across 2019–2025, with 29.4% of fall days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓5.0% of fall days were Good (AQI 0–50), 65.6% Moderate (51–100).
- ✓187 days of 637 reached AQI 101+; the fall peak was 281.
- ✓Cleanest month: November; worst month: September.
Frequently asked questions
What is the air quality like in Long Beach in fall?▾
Across 2019–2025, the median daily AQI in Long Beach in fall was 80 (Moderate). 5.0% of days were Good, 65.6% Moderate, and 29.4% reached Unhealthy for Sensitive Groups or worse, based on 637 monitored days in EPA's Air Quality System.
Is fall a good time for outdoor exercise in Long Beach?▾
A typical fall day in Long Beach is Moderate (median AQI 80): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 3 of fall days (29.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Long Beach's fall air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 48.2% of fall days in Long Beach. The highest fall AQI recorded in 2019–2025 was 281 (Very Unhealthy), in 2020.
Long Beach fall air quality, year by year
Long Beach fall air quality by year (Los Angeles-Long Beach-Anaheim, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 91 | 83 | 24 | 197 | O3 |
| 2020worst | 91 | 119 | 52 | 235 | O3 |
| 2021 | 91 | 82 | 26 | 281 | PM2.5 |
| 2022 | 91 | 68 | 17 | 209 | PM2.5 |
| 2023 | 91 | 68 | 19 | 172 | PM2.5 |
| 2024 | 91 | 87 | 40 | 209 | O3 |
| 2025cleanest | 91 | 67 | 9 | 182 | O3 |
What fall air means in Long Beach
A typical fall day in Long Beach is Moderate (median AQI 80): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 3 of fall days (29.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Fall's median AQI of 80 is above Long Beach's whole-year median of 74, making it one of the area's dirtier periods. Nationally, the median Fall AQI across every EPA metro area (296,275 metro-days, 2019–2025) is 40, so Long Beach runs above the national Fall norm; 29.4% of its Fall days topped AQI 100 versus 1.5% nationally (above average).
Within the season, November is the cleanest month (median AQI 70, 10.5% of days above 100) and September the worst (median 101, 50.0% above 100).
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Long Beach
The latest EPA AirNow observation puts Long Beach's AQI at 36 (PM2.5). The figures above are multi-year season statistics, not today's reading.
View current Long Beach air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Los Angeles-Long Beach-Anaheim, CA), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.