The highest AQ index in Pennsylvania (as of 14:00 EST) is currently the Altoona area. Ozone (OZONE) is measuring at 39 (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.
Current Conditions: At 2 p.m. EST this Friday afternoon, skies are overcast across the area, with a light northerly flow keeping fine particle pollution (PM2.5) concentrations down inside the good range. A bit of rain this afternoon will turn to a bit of snow tonight, but accumulate little. As low pressure off the east coast strengthens and pulls away, it will open the door for rather cold air to sweep in over the weekend, and it will not be until Tuesday until temperatures start to moderate. Here are the forecast details: *** Saturday’s forecast: Clouds with a snow shower to start, then windy and cold with sunshine returning Saturday. Temperatures will remain in the lower and middle 30s with strong mixing keeping PM2.5 levels low. *** Sunday’s forecast: Despite sunshine for the most part Sunday, temperatures may not get past the 30-degree mark. A north to northwest flow of clean, dry air will keep PM2.5 in the good range. *** Monday’s forecast: Partly to mostly sunny and remaining cold Monday. A morning inversion will cause PM2.5 averages to rise to the lower moderate range in parts of the area. *** Extended forecast: Moderate air quality will continue Tuesday as low pressure passes by to the north with a rain or snow shower. High pressure then builds in from the north Christmas Day and Thursday with PM2.5 concentrations in the upper good to lower moderate range.---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.