The highest AQ index in Pennsylvania (as of 9:00 EDT) is currently the Susquehanna Valley area. Particle Pollution (PM2.5) is measuring at 60 (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 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 Friday afternoon, the heat and humidity continue across the area. High relative humidity has resulted in fine particle (PM2.5) concentrations remaining in the lower moderate range, and with the strong sun, ozone levels have reached mid-moderate. Moderate air quality will continue through the weekend into early next week as temperatures continue to be above normal and flow will be weak. Here are the forecast details: *** Saturday’s forecast: Hot and humid with a better chance for afternoon and evening thunder as a cold front moves into western Pennsylvania. Ozone concentrations will reach the low to mid-moderate range with a partly sunny sky and temperatures in the middle 90s (heat indices still just over 100), and PM2.5 will remain moderate, with the highest concentrations coming during the morning. *** Sunday’s forecast: Moderate air quality overall for Sunday despite a cold frontal passage early in the day as temperatures still reach the lower 90s with a weak west wind. Skies will turn out to be mostly sunny with minimal afternoon convective activity. *** Monday’s forecast: Monday will turn out to be a similar day to Sunday with a lot of sun and temperatures crossing the 90-degree mark. Increasing weekday emissions will bring ozone higher into the moderate range, mainly along the I-95 corridor. PM2.5 averages will end up in the lower moderate range. *** Extended forecast: A slow moving cold front will affect the region Tuesday and Wednesday in the form of increasing chances for afternoon and evening thunderstorms. High relative humidity and more cloud cover will cause air quality to be mainly in the upper good/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 17 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.