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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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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
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Southwest PA Air Quality Partnership

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Air Quality Forecast
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Air Quality Index (AQI)
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Forecast Discussion: Current Conditions: As of 2 PM on Tuesday, overcast skies prevail across the region as a frontal system continues to slowly migrate eastward through Pennsylvania. Right now, the cold front associated with this storm system is moving through western PA. As a result, we are beginning to see showers move in over the region. These showers coupled with the strong northwesterly flow have helped to drive temperatures into the low 50s. After rising in isolated locations into the low moderate range this morning, PM 2.5 levels have fallen back toward the good category. Expect better air quality tomorrow as it remains cool and breezy. *** Wednesday's Forecast: So for Wednesday, expect mostly cloudy skies to persist over western PA as the area of low pressure, which was pushing through Pennsylvania during the day on Tuesday, moves off the New Jersey coastline. As it moves in over the warmer Atlantic waters, expect the system to undergo strengthening. Therefore, the threat of rain will continue for many extending from Rhode Island southward toward Delaware. Over our area, winds will remain out of the north, northwest, resulting in continual cool and dry weather over the region. Overall, afternoon temperatures will once again extend into only the low 50s. PM 2.5 levels will remain low as well due to an increase in mixing (due to elevated winds) and dry air over the area. *** Extended Outlook: Over the coming days, expect temperatures to remain at to slightly above normal as a series of systems impact the region. Here is how things are shaping up... During the second half of the week, expect the storm system, that restrengthened off the coastline of New Jersey, to move off to the north and east. At the same time, a new area of high pressure will push into the Plains. This will keep the seasonably cool and dry conditions over our area for the remainder of the work week. Over the weekend, the high pressure system will migrate eastward (out of the Plains) and toward the Northeastern US. The presence of the high near our area will help the winds swing out of the west and allow temperatures to rebound into the low to mid 60s. This will also allow PM 2.5 levels to rise back toward the good / moderate threshold. Once the high moves offshore. expect even warmer air to build in. At the same time, a new storm system will begin to move in over the Midwestern US. This system is slated to push through our area by the middle of next week, providing rain and then cooler and drier air to our region. Once the new air mass moves in, expect better air quality to persist. --Nolan

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