The highest AQ index in Pennsylvania (as of 13:00 EDT) is currently the Philadelphia area. Particle Pollution (PM2.5) is measuring at 67 (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 Ozone (OZONE) will be in the Lehigh Valley area. It is forecasted to be Good, meaning air quality is satisfactory, and air pollution poses little or no risk.
Current Conditions at 2 p.m. EDT this Wednesday afternoon: Skies are mostly sunny across the region with a seasonably warm afternoon. Ample mixing has resulted in fine particle (PM2.5) concentrations down in the good range. Ozone levels are creeping up, but only to the top of the good range. Good air quality is expected Thursday into the weekend. Here are the forecast details: *** Thursday’s forecast: Morning showers and perhaps a thunderstorm as a cold front approaches, then passes through during the afternoon. Winds will increase during the late morning and afternoon and gust past 30 mph at times. Vigorous mixing and the influx of dry air late in the day will keep ozone and PM2.5 down in the good range. Highs will reach around 90. *** Extended forecast: High pressure will slowly build in and result in cooler air and lower humidity Friday and Saturday. Highs will be limited to around 80 with low values of PM2.5 and ozone. Sunshine will give way to some clouds later Sunday, with the next weather system bringing showers and thunderstorms Sunday night into Monday. Air quality may reach moderate on Sunday, then the rain makes for lower pollutant concentrations by Monday.---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 9 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.