Air Quality
Air pollution in Pennsylvania.
Monitored days with good air quality
1990–2025U.S. EPA AirData, Annual AQI by County, all monitored Pennsylvania counties.
Monitored days unhealthy for sensitive groups or worse
1990–2025U.S. EPA AirData, Annual AQI by County (AQI above 100).
| Indicator | Pennsylvania | U.S. |
|---|---|---|
| Average PM2.5 (µg/m³)2023, EPA | 8.5 | 8.0 |
Wildfires
Wildfire activity in Pennsylvania.
| Indicator | Pennsylvania | U.S. |
|---|---|---|
| Acres burned per year2023, NIFC | 4,500 | 7.5 M |
Drought
Water stress in Pennsylvania.
Area in drought (D1–D4), yearly average
2000–2025U.S. Drought Monitor (NDMC / USDA / NOAA), average of weekly maps.
Area in extreme or exceptional drought (D3–D4)
2000–2025U.S. Drought Monitor (NDMC / USDA / NOAA), average of weekly maps.
| Indicator | Pennsylvania | U.S. |
|---|---|---|
| Share of state in drought2024, U.S. Drought Monitor | 4% | 24% |
Water Usage
Water resources in Pennsylvania.
| Indicator | Pennsylvania | U.S. |
|---|---|---|
| Per capita water use (gal/day)2015, USGS | 658 | 1,000 |
Emissions
Greenhouse gas emissions in Pennsylvania.
Energy-related CO₂ emissions
1970–2021U.S. EIA State Energy Data System, all sectors and fuels (FRED EMISSCO2TOTVTTTOPAA).
Transportation CO₂ emissions
1970–2021U.S. EIA State Energy Data System, transportation sector (FRED EMISSCO2TOTVTCTOPAA).
| Indicator | Pennsylvania | U.S. |
|---|---|---|
| Per capita CO2 emissions (tonnes)2022, EIA | 15.7 | 14.7 |
Climate Indicators
Climate trends in Pennsylvania.
Average annual temperature
1895–2025NOAA National Centers for Environmental Information, Climate at a Glance, statewide January–December average.
Annual precipitation
1895–2025NOAA National Centers for Environmental Information, Climate at a Glance, statewide January–December total.
| Indicator | Pennsylvania | U.S. |
|---|---|---|
| Warming since 1900 (°F)NOAA | 1.8 | 2.6 |