Median AQI
41
Good
Wyoming · County air quality · 2025
Converse County, Wyoming
Median AQI 41 (Good). 94.5% of monitored days rated Good, direct from EPA Air Quality System stations.
- 41
- Median AQI
- 94.5%
- Good-air days
- 0
- Unhealthy days
- 87%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Converse County's air is good on balance, cleaner than most US counties, a median AQI of 41 with 94.5% of 182 monitored days in the Good band, driven mainly by Ozone.
- 41
- median AQI · Good
- 94.5%
- days rated Good
- Ozone
- main pollutant
- 87%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 61.
Data updated July 2026
- Good · 172 d · 94.5%
- Moderate · 10 d · 5.5%
How did Converse County's air break down in 2025?
Across 182 monitored days, 172 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 61 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 182 days monitored. Median AQI: 41 (Good).
Insights: Converse County, Wyoming. EPA monitors recorded a median Air Quality Index of 41 across 182 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 172 (95%) fell in the Good band (AQI 0–50), 10 (5%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 49, while the worst single-day peak hit 61 (Moderate). Residents averaged about 28.4 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (172 days), PM10 (8 days), NO2 (1 days), CO (1 days). Across the 2020–2025 trend window, good days shifted by -130 and the median AQI moved -1 points, placing the multi-year trajectory at improving. The worst single reading over the 2020–2025 window was AQI 61, moderate but never Unhealthy. Nearby counties show comparable readings: Albany (51.9% good, AQI 50); Campbell (77.3% good, AQI 43); Carbon (100.0% good, AQI 7); Fremont (61.3% good, AQI 48); Johnson (90.6% good, AQI 42); Laramie (69.8% good, AQI 47).
Air Quality Summary
Good Days
94.5%
172 of 182 monitored days
19.5pp vs 75% target
Max AQI Recorded
61
Moderate
Health Grade
Excellent
90th-pct AQI 49
Converse County, Good days share 94.5%
National avg
Share of monitored days at AQI 0-50 (Good band).
Converse County, Unhealthy-or-worse share 0.0%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 182 monitored days across EPA AQI categories.
Good
172
95%
Moderate
10
5%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Converse County.
- Ozone · 172 days · 94.5%
- PM10 · 8 days · 4.4%
- NO₂ · 1 days · 0.5%
- CO · 1 days · 0.5%
Health Impact Assessment
Excellent
Converse County's air quality is rated Excellent based on 94.5% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 94.5% of monitored days in 2025, with a median AQI of 41. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 172 of 182 monitored days.
5-Year Air Quality Trend
Air quality is improving in Converse County. Best year: 2023 (331 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 302 | 60 | 4 | 0 | 42 | 129 |
| 2021 | 274 | 87 | 4 | 0 | 42 | 119 |
| 2022 | 314 | 51 | 0 | 0 | 40 | 90 |
| 2023 | 331 | 34 | 0 | 0 | 42 | 99 |
| 2024 | 300 | 53 | 11 | 2 | 41 | 185 |
| 2025 | 172 | 10 | 0 | 0 | 41 | 61 |
How does Converse County compare?
How Converse County compares
Good-day share better than US avg
Converse County 94.5%
Albany County, Wyoming 51.9%
US average 76.5%
Median AQI worse than US avg
Converse County 41
Albany County, Wyoming 50
US average 38
Unhealthy days / yr about average
Converse County 0
Albany County, Wyoming 0
US average 0
Other Counties in Wyoming
Air quality comparison for nearby counties in Wyoming.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Converse County.
Albemarle County, Virginia
AQI 41 · 77.9% good
Anderson County, South Carolina
AQI 41 · 90.0% good
Berkshire County, Massachusetts
AQI 41 · 71.6% good
Berrien County, Michigan
AQI 41 · 80.9% good
Blair County, Pennsylvania
AQI 41 · 71.9% good
Bonner County, Idaho
AQI 41 · 71.3% good
What Converse County's air means for you
The air here stays in the breathable range year-round, with Ozone the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 41 means for exposure. Health guidance
- See how Converse County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Converse County with its Wyoming neighbours before drawing a conclusion about the region. All of Wyoming
Based on 182 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
Frequently Asked Questions
What is the air quality in Converse County, Wyoming? ▼
Converse County has a median Air Quality Index (AQI) of 41, rated "Good." 94.5% of monitored days (172 out of 182) had good air quality in 2025.
What is the main pollutant in Converse County? ▼
The primary pollutant in Converse County is Ozone (O3), which was the main AQI driver on 172 days (95% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Converse County have? ▼
In 2025, Converse County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 61.
Is the air quality in Converse County getting better or worse? ▼
Air quality in Converse County is improving based on 5-year trends (2020-2025). Best year: 2023 with 331 good days. Worst year: 2025 with 172 good days.
What does AQI 41 mean for health? ▼
Converse County's median AQI of 41 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Converse County compare to other counties in Wyoming? ▼
Converse County has 94.5% good air days. Nearby counties in Wyoming: Albany (51.9% good), Campbell (77.3% good), Carbon (100.0% good), Fremont (61.3% good), Johnson (90.6% good), Laramie (69.8% good).
What is the 90th percentile AQI in Converse County? ▼
The 90th percentile AQI for Converse County is 49, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 61 (Moderate).
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer.
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.