Air quality in United States
Air quality in Pennsylvania today
Updated
Moderate: average US AQI 87 across 14 cities in Pennsylvania Worst now: Philadelphia (132); cleanest: Erie (44).
Live US AQI, PM2.5 and ozone for cities across Pennsylvania, compared with the United States average.
- Average US AQI
- 87 Moderate
- United States average
- 51 747 cities
- Most polluted now
- Philadelphia AQI 132
- Cleanest now
- Erie AQI 44
- Cities above 100
- 4
Air quality in Pennsylvania today
Right now the modelled air quality in Pennsylvania averages a US AQI of 87 (Moderate) across the 14 cities we track. By category: 1 Good, 9 Moderate, 4 Unhealthy for Sensitive Groups (of 14).
That is 36 points worse than the United States average of 51, ranking 50 of 51 states from cleanest to most polluted.
Philadelphia has the worst air at 132 (PM2.5 46 µg/m³), and Erie the cleanest at 44. 4 cities are above 100, where sensitive groups should limit time outdoors.
Pennsylvania cities by AQI (most polluted first)
| City | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Philadelphia | 132 | Unhealthy for Sensitive Groups | 46.1 | 48 | 31 |
| Chester | 132 | Unhealthy for Sensitive Groups | 46.1 | 48 | 31 |
| Wayne | 132 | Unhealthy for Sensitive Groups | 46.1 | 48 | 31 |
| Springfield | 132 | Unhealthy for Sensitive Groups | 46.1 | 48 | 31 |
| Reading | 92 | Moderate | 24 | 27 | 64 |
| Lebanon | 86 | Moderate | 23.4 | 27 | 65 |
| Lancaster | 78 | Moderate | 22.1 | 25 | 67 |
| Harrisburg | 74 | Moderate | 20.1 | 23 | 61 |
| York | 71 | Moderate | 21.3 | 25 | 61 |
| Allentown | 65 | Moderate | 15.5 | 18 | 73 |
| Easton | 62 | Moderate | 14.4 | 16 | 69 |
| Scranton | 56 | Moderate | 10.5 | 12 | 75 |
| Pittsburgh | 55 | Moderate | 19.5 | 20 | 64 |
| Erie | 44 | Good | 7.8 | 8 | 80 |
What the US AQI numbers mean
| US AQI | Category | What it means |
|---|---|---|
| 0-50 | Good | Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. |
| 51-100 | Moderate | Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. |
| 101-150 | Unhealthy for Sensitive Groups | People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. |
| 151-200 | Unhealthy | Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. |
| 201-300 | Very Unhealthy | Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors. |
| 301-500 | Hazardous | Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500. |
Modelled by CAMS (Copernicus) via Open-Meteo, refreshed twice a day; read hour by hour from the forecast.
Cities in Pennsylvania
- Air quality in Philadelphia
- Air quality in Pittsburgh
- Air quality in Allentown
- Air quality in Erie
- Air quality in Reading
- Air quality in Scranton
- Air quality in Lancaster
- Air quality in Harrisburg
- Air quality in York
- Air quality in Chester
- Air quality in Wayne
- Air quality in Easton
- Air quality in Lebanon
- Air quality in Springfield
More
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS).