Metro area air quality · 2025

Sacramento--Roseville--Arden-Arcade, CA

Median AQI 55 (Moderate). 35.3% of monitored days rated Good across this metro's EPA monitoring network.

55
Median AQI
35.3%
Good-air days
0
Unhealthy days
5%
Cleaner than US metros

Sacramento--Roseville--Arden-Arcade, CA posted a 2025 median AQI of 55 (Moderate) with 35.3% Good days

According to the U.S. EPA Air Quality System, the Sacramento--Roseville--Arden-Arcade, CA CBSA recorded a median AQI of 55 across 365 monitored days in 2025, with 35.3% rated Good and 0 unhealthy or worse. This is an annual metro comparison, not a live advisory.

Data source EPA Air Quality System (AQS)

Cleaner than US metros
The Sacramento--Roseville--Arden-Arcade, CA CBSA's 35.3% Good-day share places it cleaner than 5% of US metros in 2025.
Closest median-AQI peer
Bishop, CA (37.3% Good, median AQI 55) is the closest nationwide median-AQI peer to Sacramento--Roseville--Arden-Arcade, CA.
2020–2025 Good-day shift
Sacramento--Roseville--Arden-Arcade, CA's Good-day share moved +5.3 points from 2020 to 2025 (median AQI -8).
Median AQI
Median AQI: 55

Aggregated from EPA Air Quality System (2025), 365 monitored days. EPA AQS →

The verdict

Sacramento--Roseville--Arden-Arcade, CA lands in the lower Good-day tercile (35.3% Good), a thinner clean-air share than most CBSA peers here. On the EPA scale the metro runs moderate, among the more polluted US metros, with a median AQI of 55 and 35.3% of 365 monitored days in the Good band.

55
median AQI · Moderate
35.3%
days rated Good
5%
cleaner than US metros
143
worst single reading

No day crossed into the Unhealthy tier across the metro's monitors in 2025.

Annual release change

What changed in the 2025 EPA annual release

2024 → 2025
  • Sacramento--Roseville--Arden-Arcade, CA metro's Good-day share fell from 37.8% to 35.8% between the 2024 and 2025 EPA annual releases, a change of -1.9 percentage points.

Compared against 331 monitored days in 2024 and 360 in 2025. These are arithmetic differences between two stored EPA annual summaries, not a cause claim or a live advisory.

National release changes Two-year CSV

Sacramento--Roseville--Arden-Arcade, CA lands in the lower Good-day tercile (35.3% Good), a thinner clean-air share than most CBSA peers here. Signature read: 35.3% Good-day share (low tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 55 over 365 measured days in 2025 (Moderate / Poor). The monitored-day split lands at 129 Good (35%), 231 Moderate (63%), and 5 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 77; the highest single-day reading hit 143 (USG).

Across 2020–2025, Good-day share shifted +5.3 points and median AQI moved -8 (improving). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Bishop, CA (37.3% good, AQI 55); Little Rock-North Little Rock-Conway, AR (31.2% good, AQI 55); Baton Rouge, LA (35.6% good, AQI 54).

Health effects of air pollution →

Air Quality Summary

Median AQI

55

Moderate

Good Days

35.3%

129 of 365 days

Max AQI

143

USG

Health Grade

Poor

90th pct: 77

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

129

35%

Moderate

231

63%

USG

5

1%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Poor

The Sacramento--Roseville--Arden-Arcade, CA metro area's air quality is rated Poor based on 35.3% good air days. No unhealthy air days were recorded in 2025.

Air quality is generally acceptable. Unusually sensitive people should monitor real-time conditions at AirNow.gov during high-pollution events.

How does the Sacramento--Roseville--Arden-Arcade, CA metro compare?

How Sacramento--Roseville--Arden-Arcade, CA compares

Good-day share worse than typical
Sacramento--Roseville--Arden-Arcade, CA 35.3%
Bishop, CA 37.3%
Typical US metro 70.6%
Median AQI worse than typical
Sacramento--Roseville--Arden-Arcade, CA 55
Bishop, CA 55
Typical US metro 41
Unhealthy days / yr better than typical
Sacramento--Roseville--Arden-Arcade, CA 0
Bishop, CA 4
Typical US metro 1

5-Year Air Quality Trend

Air quality is improving in the Sacramento--Roseville--Arden-Arcade, CA metro. Highest Good-day share: 2024 (37.8%, 125 of 331 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 103 213 21 63
2021 97 210 10 64
2022 115 209 4 61
2023 129 222 0 58
2024 125 206 0 55
2025 129 231 0 55

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Sacramento--Roseville--Arden-Arcade, CA (55).

Bishop, CA

Median AQI 55 · 37.3% Good-day share

55

Little Rock-North Little Rock-Conway, AR

Median AQI 55 · 31.2% Good-day share

55

Baton Rouge, LA

Median AQI 54 · 35.6% Good-day share

54

Chicago-Naperville-Elgin, IL-IN-WI

Median AQI 56 · 29.9% Good-day share

56

Cincinnati, OH-KY-IN

Median AQI 56 · 26.0% Good-day share

56

Cleveland-Elyria, OH

Median AQI 54 · 42.5% Good-day share

54

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Sacramento--Roseville--Arden-Arcade, CA's 0 (independent of median AQI).

Aberdeen, SD

0 unhealthy-or-worse days · median AQI 27

27

Aberdeen, WA

0 unhealthy-or-worse days · median AQI 22

22

Adrian, MI

0 unhealthy-or-worse days · median AQI 41

41

Akron, OH

0 unhealthy-or-worse days · median AQI 45

45

Albany, GA

0 unhealthy-or-worse days · median AQI 46

46

Albany, OR

0 unhealthy-or-worse days · median AQI 27

27

Frequently Asked Questions

How many unhealthy air days does Sacramento--Roseville--Arden-Arcade, CA have? ▼
In 2025, the Sacramento--Roseville--Arden-Arcade, CA metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 143.
What is the air quality in the Sacramento--Roseville--Arden-Arcade, CA metro area? ▼
The Sacramento--Roseville--Arden-Arcade, CA metro area has a median Air Quality Index (AQI) of 55, rated "Moderate." 35.3% of monitored days (129 out of 365) had good air quality in 2025.
Is air quality in Sacramento--Roseville--Arden-Arcade, CA getting better or worse? ▼
Air quality in the Sacramento--Roseville--Arden-Arcade, CA metro is improving across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2024 at 37.8% (125 of 331 days). Lowest qualifying Good-day share: 2020 at 30.6% (103 of 337 days).
What does AQI 55 mean for health? ▼
An AQI of 55 is "Moderate", air quality is acceptable, but some pollutants may pose a moderate health concern for a small number of sensitive individuals.
How does Sacramento--Roseville--Arden-Arcade, CA compare to other metro areas? ▼
The Sacramento--Roseville--Arden-Arcade, CA metro has 35.3% good air days. Similar metros: Bishop, CA (37.3% good), Little Rock-North Little Rock-Conway, AR (31.2% good), Baton Rouge, LA (35.6% good).
What is the 90th percentile AQI for Sacramento--Roseville--Arden-Arcade, CA? ▼
The 90th percentile AQI for the Sacramento--Roseville--Arden-Arcade, CA metro area is 77, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 143 (USG).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for Sacramento--Roseville--Arden-Arcade, CA, 2025. See our methodology for how AQI, median, and coverage figures are computed.

Read our methodology , how this data is sourced, computed, and verified.

Source: U.S. EPA Air Quality System (AQS) Annual AQI by CBSA summary, Sacramento--Roseville--Arden-Arcade, CA · 2020–2025