Karthaus, Pennsylvania Air Quality
Karthaus air quality today — the AQI, the main pollutant, and whether it’s safe to exercise outside right now
Karthaus, PA · Air quality right now
The air quality index in Karthaus, PA is 33 (Good) right now — safe for outdoor activity.
Is it safe to be outside in Karthaus today?
AQI 33 Yes — air quality is Good
Air is clean — great for outdoor activity.Main pollutant: OzoneObserved 2:00 AM EDT
Pollutants right now
- PM2.56.8 µg/m³fine particles — smoke, exhaust, soot
- PM107.1 µg/m³coarse particles — dust, pollen, ash
- Ozone74 µg/m³Main pollutantsmog — builds on hot, sunny days
- NO₂1.6 µg/m³nitrogen dioxide — traffic, combustion
ExerciseOK to run — no air-quality limits on outdoor exercise.
How to read Karthaus’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 Karthaus
Across the EPA’s county records from 2020 to 2022, Karthaus’s cleanest year was 2020 (median AQI 31) and its most polluted was 2022 (median AQI 35); the typical (median) day has trended more polluted since 2020.
| Year | Median AQI | Unhealthy+ | Main pollutant | USG | Moderate | Good |
|---|---|---|---|---|---|---|
| 2020 | 31 | 0 | Ozone | 0 | 2 | 341 |
| 2021 | 33 | 0 | Ozone | 0 | 3 | 274 |
| 2022 | 35 | 0 | Ozone | 0 | 4 | 215 |
“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, 2020–2022.
Frequently asked
- What was the worst year for air quality in Karthaus?
- No day in Karthaus's county topped AQI 100 in the EPA's 2020–2022 records. The highest median AQI came in 2022, at 35.
- How many unhealthy air days does Karthaus have?
- None: across 2020–2022, no day in Karthaus's county had an AQI above 100 in the EPA's records (839 days reported).
- What's the main air pollutant in Karthaus?
- Ozone: it drove Karthaus's county AQI on the most days in every year of the EPA's 2020–2022 records.