Metro area air quality · 2025

Sheridan, WY

Median AQI 33 (Good). 84.6% of monitored days rated Good across this metro's EPA monitoring network.

33
Median AQI
84.6%
Good-air days
0
Unhealthy days
76%
Cleaner than US metros

Aggregated from EPA Air Quality System (2025), 175 monitored days. EPA AQS →

The verdict

The Sheridan, WY metro runs good on the EPA scale, cleaner than most US metros, a median AQI of 33 with 84.6% of 175 monitored days in the Good band.

33
median AQI · Good
84.6%
days rated Good
76%
cleaner than US metros
70
worst single reading

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

Insights: Sheridan, WY metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 33 over 175 measured days in 2025, which corresponds to a Good band and a Good metro-wide health grade. The monitored-day split lands at 148 Good days (85%), 27 Moderate (15%), and 0 Unhealthy-for-Sensitive-Groups (0%). The 90th-percentile AQI finished at 53 while the highest single-day reading hit 70 (Moderate). Metro residents averaged roughly 25.4 clean-air days per 30-day window across the reporting year.

Across the 2020–2025 trend window, good days shifted by -186 and the median AQI moved -7 points, which classifies the multi-year trajectory as worsening. The metro avoided any Unhealthy-tier days entirely, an outcome that typically reflects favorable wind patterns, lower industrial density, or effective regional emission controls. Metros with comparable AQI profiles include Athens, OH (80.3% good, AQI 33); Crescent City, CA (81.0% good, AQI 33); Jackson, TN (79.6% good, AQI 33).

Air Quality Summary

Median AQI

33

Good

Good Days

84.6%

148 of 175 days

Max AQI

70

Moderate

Health Grade

Good

90th pct: 53

AQI Day Breakdown (2025)

Distribution of 175 monitored days across EPA AQI categories.

Good

148

85%

Moderate

27

15%

USG

0

0%

Unhealthy

0

0%

Very Unhealthy

0

0%

Hazardous

0

0%

Health Impact Assessment

Good

The Sheridan, WY metro area's air quality is rated Good based on 84.6% 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 Sheridan, WY metro compare?

How Sheridan, WY compares

Good-day share better than US avg
Sheridan, WY 84.6%
Athens, OH 80.3%
US average 71.3%
Median AQI better than US avg
Sheridan, WY 33
Athens, OH 33
US average 41
Unhealthy days / yr better than US avg
Sheridan, WY 0
Athens, OH 0
US average 1

5-Year Air Quality Trend

Air quality is worsening in the Sheridan, WY metro. Best year: 2020 (334 good days).

Year Good Moderate Unhealthy Median AQI
2020 334 32 0 40
2021 302 55 0 40
2022 270 95 0 44
2023 283 79 1 43
2024 281 69 6 44
2025 148 27 0 33

Metros with Similar Air Quality

Metro areas across the US with a similar median AQI to Sheridan, WY.

Athens, OH

AQI 33 · 80.3% good

33

Crescent City, CA

AQI 33 · 81.0% good

33

Jackson, TN

AQI 33 · 79.6% good

33

Watertown, SD

AQI 33 · 82.1% good

33

Bangor, ME

AQI 34 · 86.1% good

34

Baraboo, WI

AQI 34 · 79.6% good

34

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 Sheridan, WY metro area? ▼
The Sheridan, WY metro area has a median Air Quality Index (AQI) of 33, rated "Good." 84.6% of monitored days (148 out of 175) had good air quality in 2025.
How many unhealthy air days does Sheridan, WY have? ▼
In 2025, the Sheridan, WY metro area recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 70.
Is air quality in Sheridan, WY getting better or worse? ▼
Air quality in the Sheridan, WY metro is worsening based on 5-year trends (2020-2025). Best year: 2020 with 334 good days. Worst year: 2025 with 148 good days.
What does AQI 33 mean for health? ▼
An AQI of 33 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 Sheridan, WY? ▼
The 90th percentile AQI for the Sheridan, WY metro area is 53, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 70 (Moderate).
How does Sheridan, WY compare to other metro areas? ▼
The Sheridan, WY metro has 84.6% good air days. Similar metros: Athens, OH (80.3% good), Crescent City, CA (81.0% good), Jackson, TN (79.6% 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

Every figure on PlainAir 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.