Alma Center, Wisconsin Air Quality
Alma Center air quality today — the AQI, the main pollutant, and whether it’s safe to exercise outside right now
Alma Center, WI · Air quality right now
The air quality index in Alma Center, WI is 23 (Good) right now — safe for outdoor activity.
Is it safe to be outside in Alma Center today?
AQI 23 Yes — air quality is Good
Air is clean — great for outdoor activity.Main pollutant: OzoneObserved 8:00 AM CDT
Pollutants right now
- PM2.50.9 µg/m³fine particles — smoke, exhaust, soot
- PM100.9 µg/m³coarse particles — dust, pollen, ash
- Ozone46 µg/m³Main pollutantsmog — builds on hot, sunny days
- NO₂2.0 µg/m³nitrogen dioxide — traffic, combustion
ExerciseOK to run — no air-quality limits on outdoor exercise.
How to read Alma Center’s air quality
Guides: The AQI Scale, Explained · Air Quality Alerts, Decoded · How to Read a Wildfire Smoke Map · Why Wildfire Smoke Travels 1,000 Miles.
Air quality over time in Alma Center
Across the EPA’s county records from 2021 to 2025, Alma Center’s cleanest year was 2024 (median AQI 27) and its most polluted was 2025 (median AQI 36); the typical (median) day has held roughly steady since 2021.
| Year | Median AQI | Unhealthy+ | Main pollutant | USG | Moderate | Good |
|---|---|---|---|---|---|---|
| 2021 | 31 | 0 | PM2.5 | 0 | 50 | 187 |
| 2022 | 30 | 0 | PM2.5 | 1 | 60 | 298 |
| 2023 | 33 | 2 | PM2.5 | 4 | 103 | 253 |
| 2024 | 27 | 0 | PM2.5 | 0 | 39 | 238 |
| 2025 | 36 | 2 | PM2.5 | 8 | 93 | 229 |
“USG” is Unhealthy for Sensitive Groups (AQI 101–150); “Unhealthy+” combines the Unhealthy, Very Unhealthy, and Hazardous days. In 2024 the EPA tightened the annual fine-particle (PM2.5) standard to 9 µg/m³ from the previous 12 µg/m³, so counties near the old limit read worse against the new one. Source: EPA AQS annual summaries, 2021–2025.
Frequently asked
- What was the worst year for air quality in Alma Center?
- In the EPA's 2021–2025 county records, 2025 had the most days above AQI 100: 10 days (8 Unhealthy for Sensitive Groups, 2 Unhealthy or worse). It also had the highest median AQI, 36.
- How many unhealthy air days does Alma Center have?
- Across 2021–2025, 1% of the days reported for Alma Center's county had an AQI above 100 (17 of 1567), about 3 days a year. 2025 had 10 days.
- What's the main air pollutant in Alma Center?
- PM2.5: it drove Alma Center's county AQI on the most days in every year of the EPA's 2021–2025 records.