The highest AQ index in Pennsylvania (as of 13:00 EDT) is currently the Philadelphia area. Particle Pollution (PM2.5) is measuring at 55 (Moderate). This means air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Over the next few days, the highest Particle Pollution (PM2.5) will be in the Lehigh Valley 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.
Current Conditions at 2 p.m. EST this Friday afternoon: Overcast skies continue across the area with light southeast winds keeping fine particle pollution (PM2.5) in the moderate range. We will eventually break out of this pattern as winds become westerly Saturday night and Sunday. *** Saturday’s forecast: Areas of morning fog, otherwise mostly cloudy Saturday with a milder afternoon. Light south to southeast wind flow will maintain moderate PM2.5 levels. A couple of showers are likely late in the day and Saturday night as a cold front approaches. *** Sunday’s forecast: Winds finally shift into westerly mode Sunday, and this allows for some sunshine to return in the afternoon. Moderate PM2.5 will continue with a morning shower possible. *** Monday’s forecast: Times of clouds and sunshine Monday with a warmer afternoon as temperatures rise well into the 60s. Afternoon mixing and dispersion will lower PM2.5, with highest concentrations by morning. *** Extended forecast: The warmest day of the forecast period will come on Tuesday with 70-degree temperatures possible for the first time since last fall. PM2.5 concentrations will be highest in the morning, lower during the afternoon. The next cold front approaches Wednesday with rain and even a thunderstorm possible, then turning chillier late in the week with temperatures returning closer to normal mid-March levels. Good air quality should prevail Wednesday and Thursday. ---McAuliffe
| 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 7 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.