Lehigh Valley
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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
Local Air Quality Resources
Current Air Quality Index | Forecast | Ozone Action Program
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)
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion.
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AQI - Pollutant Details
Particles (PM2.5)
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Forecast Discussion: Current Conditions: At 1 p.m. EDT this Tuesday afternoon, high pressure was located over the Delmarva peninsula and was drifting eastward off the coast. Southwesterly winds have transported more humid air into the area as a result. Because clouds were slow to break today, most locations are still in the good range with ozone, but moderate pockets will still develop this afternoon. High humidity and a light surface flow are contributing to moderate PM levels, and this will be the case into the day Wednesday. There can be a thunderstorm in one or two spots this evening, otherwise tonight will be clear to partly cloudy, but warm and muggy. Low temperatures will only drop to around 70. *** Wednesday's forecast: A strong cold front will cross the area late in the day Wednesday or early Wednesday evening. Out ahead of it heat and humidity will continue to build. Afternoon temperatures will reach into the lower 90s with a fair amount of sunshine. Thunderstorms will then build into the area later Wednesday afternoon and Wednesday evening. Hard downpours and gusty winds are possible. Enough sunshine will boost ozone levels into the lower moderate range, and fine particulate will also remain in the moderate zone. Turning cooler Wednesday overnight with a couple of showers lingering. *** Extended forecast: A progressive weather pattern will continue into the early part of next week, so prolonged periods of poor air quality are unlikely. Cooler and much less humid Thursday in the wake of a cold front. A morning shower will give way to sunshine by the afternoon with temperatures struggling to get to the 80 degree mark. A north to northwesterly flow will promote low concentrations of both ozone and fine particulate. High pressure will then build overhead by Friday, bringing a sunny and pleasant day to the region. Afternoon temperatures will recover into the lower 80s, and with a dry northwest flow continuing, low levels of ozone and fine particulate will result. Humidity will then build back into the area over the weekend, with increasing chances for afternoon thunderstorm activity, especially during the day Sunday into Monday with the next cold front approaching. Air quality may thus deteriorate to the moderate range once more. A return to good air quality is then possible by Tuesday of next week as a new air mass of Canadian origin moves southeastward.--McAuliffe

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