Sacramento Air Quality in May
Across 2019–2025, Sacramento's May air quality had a median AQI of 54 (Moderate) over 217 monitored days in the Sacramento--Roseville--Arden-Arcade, CA area. 1.4% of May days (3 of 217) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 84.8% of days. The cleanest May on record here was 2022 (median AQI 49, 0 days above 100) and the worst was 2021 (median 62, 1 day above 100, peak AQI 122).
- Good: 43.3%
- Moderate: 55.3%
- Unhealthy for Sensitive Groups: 1.4%
- Unhealthy or worse: 0.0%
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How is the air in Sacramento in May?
Moderate on a typical day: median AQI 54 across 2019–2025, with 1.4% of May days above AQI 100. Ground-level ozone is the main driver.
- ✓43.3% of May days were Good (AQI 0–50), 55.3% Moderate (51–100).
- ✓3 days of 217 reached AQI 101+; the May peak was 122.
- ✓Best May: 2022; worst May: 2021.
Frequently asked questions
What is the air quality like in Sacramento in May?▾
Across 2019–2025, the median daily AQI in Sacramento in May was 54 (Moderate). 43.3% of days were Good, 55.3% Moderate, and 1.4% reached Unhealthy for Sensitive Groups or worse, based on 217 monitored days in EPA's Air Quality System.
Is May a good time for outdoor exercise in Sacramento?▾
A typical May day in Sacramento is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 71 of May days (1.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Sacramento's May air quality problems?▾
Ground-level ozone set the daily AQI on 84.8% of May days in Sacramento. The highest May AQI recorded in 2019–2025 was 122 (Unhealthy for Sensitive Groups), in 2021.
Sacramento May air quality, year by year
Sacramento May air quality by year (Sacramento--Roseville--Arden-Arcade, CA, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 31 | 51 | 0 | 92 | O3 |
| 2020 | 31 | 47 | 1 | 101 | O3 |
| 2021worst | 31 | 62 | 1 | 122 | O3 |
| 2022cleanest | 31 | 49 | 0 | 100 | O3 |
| 2023 | 31 | 52 | 1 | 112 | O3 |
| 2024 | 31 | 51 | 0 | 100 | O3 |
| 2025 | 31 | 58 | 0 | 93 | O3 |
What May air means in Sacramento
A typical May day in Sacramento is Moderate (median AQI 54): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 71 of May days (1.4%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
May's median AQI of 54 is below Sacramento's whole-year median of 58, making it one of the area's cleaner periods. Nationally, the median May AQI across every EPA metro area (104,064 metro-days, 2019–2025) is 44, so Sacramento runs above the national May norm; 1.4% of its May days topped AQI 100 versus 1.3% nationally (about the same).
May is part of Sacramento's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Sacramento
The latest EPA AirNow observation puts Sacramento's AQI at 43 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Sacramento air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Sacramento--Roseville--Arden-Arcade, 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.