Metro area air quality · 2025
St. George, UT
Median AQI 44 (Good). 75.1% of monitored days rated Good across this metro's EPA monitoring network.
- 44
- Median AQI
- 75.1%
- Good-air days
- 0
- Unhealthy days
- 57%
- Cleaner than US metros
St. George, UT posted a 2025 median AQI of 44 (Good) with 75.1% Good days
According to the U.S. EPA Air Quality System, the St. George, UT CBSA recorded a median AQI of 44 across 365 monitored days in 2025, with 75.1% 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 St. George, UT CBSA's 75.1% Good-day share places it cleaner than 57% of US metros in 2025.
- Closest median-AQI peer
- Bartlesville, OK (68.0% Good, median AQI 44) is the closest nationwide median-AQI peer to St. George, UT.
- 2020–2025 Good-day shift
- St. George, UT's Good-day share moved -1.0 points from 2020 to 2025 (median AQI +0).
- Median AQI
- Median AQI: 44
Aggregated from EPA Air Quality System (2025), 365 monitored days. EPA AQS →
The verdict
St. George, UT's Good-day share (75.1%) sits in the middle CBSA tercile on this extract. On the EPA scale the metro runs good, cleaner than the median US metro, with a median AQI of 44 and 75.1% of 365 monitored days in the Good band.
- 44
- median AQI · Good
- 75.1%
- days rated Good
- 57%
- cleaner than US metros
- 97
- 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
- St. George, UT metro's Good-day share fell from 76.4% to 75.1% between the 2024 and 2025 EPA annual releases, a change of -1.3 percentage points.
- St. George, UT metro's peak single-day AQI fell from 108 to 97 between the 2024 and 2025 EPA annual releases, a change of -11 points.
St. George, UT's Good-day share (75.1%) sits in the middle CBSA tercile on this extract. Signature read: 75.1% Good-day share (mid tercile vs CBSA corpus). Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 44 over 365 measured days in 2025 (Good / Good). The monitored-day split lands at 274 Good (75%), 91 Moderate (25%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 64; the highest single-day reading hit 97 (Moderate).
Across 2020–2025, Good-day share shifted -1.0 points and median AQI moved +0 (stable). No Unhealthy-tier days appear in this annual dataset. Metros with comparable AQI profiles include Bartlesville, OK (68.0% good, AQI 44); Berlin, NH-VT (81.5% good, AQI 44); Bloomington, IL (66.0% good, AQI 44).
Air Quality Summary
Median AQI
44
Good
Good Days
75.1%
274 of 365 days
Max AQI
97
Moderate
Health Grade
Good
90th pct: 64
AQI Day Breakdown (2025)
Distribution of 365 monitored days across EPA AQI categories.
Good
274
75%
Moderate
91
25%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The St. George, UT metro area's air quality is rated Good based on 75.1% 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 St. George, UT metro compare?
How St. George, UT compares
5-Year Air Quality Trend
Air quality is stable in the St. George, UT metro. Highest Good-day share: 2023 (79.7%, 291 of 365 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 276 | 87 | 0 | 44 | 112 |
| 2021 | 256 | 106 | 1 | 45 | 163 |
| 2022 | 288 | 77 | 0 | 44 | 97 |
| 2023 | 291 | 74 | 0 | 43 | 90 |
| 2024 | 278 | 86 | 0 | 44 | 108 |
| 2025 | 274 | 91 | 0 | 44 | 97 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near St. George, UT (44).
Bartlesville, OK
Median AQI 44 · 68.0% Good-day share
Berlin, NH-VT
Median AQI 44 · 81.5% Good-day share
Bloomington, IL
Median AQI 44 · 66.0% Good-day share
Boston-Cambridge-Newton, MA-NH
Median AQI 44 · 71.0% Good-day share
Bridgeport-Stamford-Norwalk, CT
Median AQI 44 · 64.7% Good-day share
Buffalo-Cheektowaga-Niagara Falls, NY
Median AQI 44 · 63.8% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to St. George, UT's 0 (independent of median AQI).
Aberdeen, SD
0 unhealthy-or-worse days · median AQI 27
Aberdeen, WA
0 unhealthy-or-worse days · median AQI 22
Adrian, MI
0 unhealthy-or-worse days · median AQI 41
Akron, OH
0 unhealthy-or-worse days · median AQI 45
Albany, GA
0 unhealthy-or-worse days · median AQI 46
Albany, OR
0 unhealthy-or-worse days · median AQI 27
Frequently Asked Questions
How many unhealthy air days does St. George, UT have? ▼
What is the air quality in the St. George, UT metro area? ▼
Is air quality in St. George, UT getting better or worse? ▼
What does AQI 44 mean for health? ▼
How does St. George, UT compare to other metro areas? ▼
What is the 90th percentile AQI for St. George, UT? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset for St. George, UT, 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, St. George, UT · 2020–2025