Metro area air quality · 2025

Vernal, UT

Median AQI 48 (Good). 58.4% of monitored days rated Good across this metro's EPA monitoring network.

48
Median AQI
58.4%
Good-air days
0
Unhealthy days
23%
Cleaner than US metros

Vernal, UT posted a 2025 median AQI of 48 (Good) with 58.4% Good days

According to the U.S. EPA Air Quality System, the Vernal, UT CBSA recorded a median AQI of 48 across 365 monitored days in 2025, with 58.4% 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 Vernal, UT CBSA's 58.4% Good-day share places it cleaner than 23% of US metros in 2025.
Closest median-AQI peer
Baltimore-Columbia-Towson, MD (58.1% Good, median AQI 48) is the closest nationwide median-AQI peer to Vernal, UT.
2020–2025 Good-day shift
Vernal, UT's Good-day share moved +3.3 points from 2020 to 2025 (median AQI -2).
Median AQI
Median AQI: 48

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

The verdict

The Vernal, UT metro runs good on the EPA scale, among the more polluted US metros, a median AQI of 48 with 58.4% of 365 monitored days in the Good band.

48
median AQI · Good
58.4%
days rated Good
23%
cleaner than US metros
126
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
  • Vernal, UT metro's Good-day share fell from 60.7% to 59.0% between the 2024 and 2025 EPA annual releases, a change of -1.7 percentage points.

Compared against 359 monitored days in 2024 and 361 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

Insights: Vernal, UT metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 48 over 365 measured days in 2025, which corresponds to a Good band and a Moderate metro-wide health grade. The monitored-day split lands at 213 Good days (58%), 148 Moderate (41%), and 4 Unhealthy-for-Sensitive-Groups (1%). The 90th-percentile AQI finished at 77 while the highest single-day reading hit 126 (USG). Metro residents averaged roughly 17.5 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +3.3 points and the median AQI moved -2 points, which classifies the multi-year trajectory as improving. The metro recorded no Unhealthy-tier days in this annual dataset. Metros with comparable AQI profiles include Baltimore-Columbia-Towson, MD (58.1% good, AQI 48); Boulder, CO (58.4% good, AQI 48); Columbus, GA-AL (53.4% good, AQI 48).

Air Quality Summary

Median AQI

48

Good

Good Days

58.4%

213 of 365 days

Max AQI

126

USG

Health Grade

Moderate

90th pct: 77

AQI Day Breakdown (2025)

Distribution of 365 monitored days across EPA AQI categories.

Good

213

58%

Moderate

148

41%

USG

4

1%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Moderate

The Vernal, UT metro area's air quality is rated Moderate based on 58.4% 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 Vernal, UT metro compare?

How Vernal, UT compares

Good-day share worse than typical
Vernal, UT 58.4%
Baltimore-Columbia-Towson, MD 58.1%
Typical US metro 70.6%
Median AQI worse than typical
Vernal, UT 48
Baltimore-Columbia-Towson, MD 48
Typical US metro 41
Unhealthy days / yr better than typical
Vernal, UT 0
Baltimore-Columbia-Towson, MD 0
Typical US metro 1

5-Year Air Quality Trend

Air quality is improving in the Vernal, UT metro. Highest Good-day share: 2022 (66.3%, 242 of 365 monitored days).

Year Good Moderate Unhealthy Median AQI
2020 201 160 0 50
2021 190 149 2 50
2022 242 123 0 47
2023 154 174 18 54
2024 218 141 0 48
2025 213 148 0 48

Metros with a similar median AQI

CBSA peers nationwide whose annual median AQI sits near Vernal, UT (48).

Baltimore-Columbia-Towson, MD

Median AQI 48 · 58.1% Good-day share

48

Boulder, CO

Median AQI 48 · 58.4% Good-day share

48

Columbus, GA-AL

Median AQI 48 · 53.4% Good-day share

48

Durango, CO

Median AQI 48 · 60.8% Good-day share

48

Greenville-Anderson-Mauldin, SC

Median AQI 48 · 55.3% Good-day share

48

Knoxville, TN

Median AQI 48 · 56.4% Good-day share

48

Metros with similar unhealthy-day exposure

A second relationship type: metros whose unhealthy-or-worse day count is closest to Vernal, UT'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

More Air Quality Data

Explore EPA air quality rankings and guides across U.S. metros and counties.

Cleanest Metro Areas

U.S. metros ranked by their share of Good air-quality days.

Worst Air Quality

Counties and metros with the most unhealthy air days.

All Metro Areas

Annual AQI by CBSA for every monitored U.S. metro area.

Best and Worst City Air

What drives urban air quality and how metro areas compare.

Air Quality Guides

Frequently Asked Questions

What is the air quality in the Vernal, UT metro area? ▼
The Vernal, UT metro area has a median Air Quality Index (AQI) of 48, rated "Good." 58.4% of monitored days (213 out of 365) had good air quality in 2025.
How many unhealthy air days does Vernal, UT have? ▼
In 2025, the Vernal, UT metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 126.
Is air quality in Vernal, UT getting better or worse? ▼
Air quality in the Vernal, UT 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: 2022 at 66.3% (242 of 365 days). Lowest qualifying Good-day share: 2023 at 44.5% (154 of 346 days).
What does AQI 48 mean for health? ▼
An AQI of 48 is "Good", air quality is satisfactory and poses little or no health risk. This is the best category on the EPA's AQI scale.
What is the 90th percentile AQI for Vernal, UT? ▼
The 90th percentile AQI for the Vernal, UT metro area is 77, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 126 (USG).
How does Vernal, UT compare to other metro areas? ▼
The Vernal, UT metro has 58.4% good air days. Similar metros: Baltimore-Columbia-Towson, MD (58.1% good), Boulder, CO (58.4% good), Columbus, GA-AL (53.4% good).

Data Sources

Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2025. 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 files (metro-level) · 2020–2025

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Every figure on PlainAirData is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.