The highest AQ index in Pennsylvania (as of 16:00 EDT) is currently the Mercer County area. Ozone (OZONE) is measuring at 30 (Good). This means air quality is satisfactory, and air pollution poses little or no risk.
Over the next few days, the highest Particle Pollution (PM2.5) will be in the Philadelphia area. It is forecasted to be Moderate, meaning air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Important Information: Daily Ozone Forecasts will be ending for the season on Wednesday, September 30th. Ozone forecasts will resume April 2027. *** Current Conditions: A strong storm is spinning along the New England coastline today, bringing plenty of clouds, a light northerly breeze, and good air quality for ozone and fine particulate matter (PM2.5). *** Tuesday: The New England storm that brought plenty of clouds and rain to Pennsylvania will depart out to sea. Aside from some lingering low clouds Tuesday morning, gradual clearing is expected. The combination of a light northwest wind and morning cloud cover will keep ozone in the good range, and PM2.5 will be in the high-end good range. Highs will be in the mid-70s. *** Extended Forecast: High pressure will settle over the Mid-Atlantic midweek, causing warm, dry and tranquil conditions. Air quality for ozone and PM2.5 will reach the low-end moderate category as the flow becomes westerly and full sunshine heats the ground. Temperatures will be bordering 80 degrees. Moderate air quality will continue into Thursday with high pressure remaining in control. Full afternoon sunshine will warm the air into the lower 80s Thursday afternoon. Moderate air quality may also persist into Friday, but a cold front will bring the return of good air quality this weekend with more clouds and rain.--Curtis
| Range | 0 - 50 | 51 - 100 | 101 - 150 | 151 - 200 | 201 - 300 | 301 - 500 |
| Color | ||||||
| Category | Good | Moderate | Unhealthy for Sensitive Groups | Unhealthy | Very Unhealthy | Hazardous |
Last Updated 25 minutes ago
Below is a list of counties in Pennsylvania. Click on any county below and you'll get a list of cities where we provide AQ index forecasts.