The highest AQ index in Pennsylvania (as of 18:00 EDT) is currently the Philadelphia area. Ozone (OZONE) is measuring at 112 (Unhealthy for Sensitive Groups). This means members of sensitive groups may experience health effects. The general public is less likely to be affected.
Over the next few days, the highest Ozone (OZONE) 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. EDT this Wednesday afternoon: Skies are mostly sunny across the area as temperatures move into the lower and middle 80s. Ozone levels are going into the lower moderate range with the sunshine, but fine particle (PM2.5) remain low. PM2.5 levels will increase a little over the next couple of days as the air mass becomes more humid. The chance for showers and thunderstorms will be elevated Thursday and Friday as a couple of weather systems affect the area. Here are the forecast details: *** Thursday’s forecast: More clouds than sunshine, warm, and humid Thursday with showers and thunderstorms developing. Ozone will remain in the high good range with the clouds and precipitation. Particle concentrations will increase to perhaps the lower moderate range. *** Extended forecast: Moderate air quality continues Friday with respect to PM2.5 and ozone as skies will be cloudy to partly sunny, and still the chance for showers and thunderstorms. High pressure should bring mainly dry conditions over the weekend, with mainly moderate PM2.5 and ozone levels. We will also keep an eye on the southward progression of wildfire smoke from eastern Canada and it’s potential effect on local air quality.---McAuliffe
| Range | 0 - 50 | 51 - 100 | 101 - 150 | 151 - 200 | 201 - 300 | 301 - 500 |
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| Category | Good | Moderate | Unhealthy for Sensitive Groups | Unhealthy | Very Unhealthy | Hazardous |
Last Updated 14 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.