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AQI: Good (0 - 50) AQI: Moderate (51 - 100) AQI: Unhealthy for Sensitive Groups (101 - 150) AQI: Unhealthy (151 - 200) AQI: Very Unhealthy (201 - 300) AQI: Hazardous(301 - 500) Action DayAction Day
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State Air Quality Resources
Air Quality Partnership of Lehigh Valley - Berks
Air Quality Partnership of the Delaware Valley
Air Quality Partnership of the Susquehanna Valley
American Lung Association (ALA) of Pennsylvania
PA Allergy & Asthma Association
Pennsylvania DEP - BAQ - Contacts
Pennsylvania DEP - BAQ - Current Air Quality Index (AQI) by Area
Pennsylvania DEP - Bureau of Air Quality (BAQ)
Pennsylvania DEP – Air Quality Forecast Home Page
Pennsylvania DEP – Home Page
Southwest PA Air Quality Partnership

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Air Quality Forecast
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Air Quality Index (AQI)
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Particles (PM2.5)
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Forecast Discussion: Current Conditions: As of 2 PM on Wednesday, partly sunny skies prevail over the region as high pressure remains in control of our weather. At the same time, a cold front continues to drop south from the Great Lakes toward our region. As a result, the threat of showers and thunderstorms exist through the remainder of today. Right now, westerly flow has helped to keep warm and moist air over our region. Temperatures currently reside in the low to mid 80s with dewpoints hovering in the 60s. The combination of the warm and moist conditions over western PA has helped to drive PM 2.5 levels into the moderate range. Cloud cover continues to limit ozone formation. Expect air quality conditions to improve tomorrow as we see more of Canadian air mass move in over the region. *** Thursday's Forecast: So for Thursday, expect mostly cloudy skies early in the day to give way to clearer skies during the afternoon as the cold front, which pushed through on Wednesday, pushes off to our south and east. At the same time, a new area of high pressure will build in over the Midwestern US. This high will steer our flow out of the north, allowing a cooler, and more importantly drier air mass to build in over our area. As a result, afternoon highs will only peak in the upper 70s. The combination of the cool and dry air building in from Canada will help to keep ozone and PM 2.5 confined to the good range. *** Extended Outlook: Over the coming days, expect temperatures to remain near to slightly below normal as another storm system impacts our area. Here is how things are shaping up... On Friday, expect another cool and dry day to persist over the region as the area of high pressure, which was off to our west on Thursday, continues to move off to our east. At the same time, a new cold front will begin to push in over the Midwestern US. On Saturday, a warm front pushing through our area could trigger some shower development. Warmer air will move in later in the day. The cold front associated with this system will press through later on Sunday. Overall, expect there to be a rise in PM 2.5 levels once the warm and moist conditions return on Saturday into Sunday. Cloud cover will continue to hold ozone back. The cold front passage late Sunday will allow a new high pressure system to move in over the Great Lakes region. This high will tap into an even cooler and drier air mass. Expect temperatures to reside in the low 70s to start the next week. As a result of this new air mass moving in, expect air quality levels to drop back into the good range. --Nolan

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