Lehigh Valley
 
Data courtesy of:
 

 
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
Air Quality Action Day Program | Current Air Quality Index | Forecast
 
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
Air Quality Forecast
Today's High Tomorrow's High
Air Quality Index (AQI)
55 
Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion.
Air Quality Index (AQI)
45 
Good
Health Message: None
AQI - Pollutant Details
Particles (PM2.5)
55 
Moderate
Ozone
45 
Good
Particles (PM2.5)
45 
Good
Ozone
40 
Good
Forecast Discussion: Current Conditions: As of 2 PM on Friday, partly cloudy skies continue to persist over the region as higher pressure controls our weather. Right now, the flow remains out of the south, resulting in temperatures rising into the low to mid 80s. In addition, dewpoint temperatures have remained in the 60s. The combination of the warm and moist air mass has helped to drive PM 2.5 levels into the moderate range. Ozone, on the other hand, is being limited due to the cloud cover. Expect the moderate air quality to linger in Saturday as we await the passage of a cold front. The cold front will influence our weather primarily late Saturday to Monday, resulting in better air quality. Here are the day-to-day details... *** On Saturday, mostly cloudy skies will prevail over the region as a frontal system begins its approach from the west. This frontal system will end up driving rain into our area late in the day. The southerly flow in advance of the front will allow temperatures to approach the low 80s. However, it will be the cloud cover and afternoon rain that will limit ozone formation to the good threshold. PM 2.5 will remain elevated in the moderate range, thanks to the warm and humid conditions over the area. *** For Sunday, overcast skies will persist over eastern PA as the frontal system, which began to approach our area on Saturday, slowly treks east. With the frontal system moving closer, expect rain to continue over the region. The cloud cover and rain will not only limit temperatures to the low 70s but also ozone. With no mechanism for photochemistry, ozone will remain in the good range. With the rain, there will be an increase in vertical mixing. Therefore, PM 2.5 levels are expected to drop into the upper good category. *** On Monday, mostly cloudy skies will continue to prevail over the region as the cold front slowly tracks off to our east. The presence of the front will mean we will continue to see a chance of rain. Just like on Sunday, it will be the clouds and rain that will limit ozone formation to the good category. As a cooler and drier air mass begins to settle in (temperatures will peak near 70 while dewpoints drop into the 50s), PM 2.5 levels will continue to hover within the good threshold. *** Extended Outlook: As we take a peek into next week, we notice that the week will start off on the cool and wet side as a cold front continues its slow progression through the region. The front should clear the region by Tuesday, allowing for clearer skies and warmer temperatures to return by mid week. By the end of the week, afternoon temperatures will extend back into the 80s as higher pressure takes control over our weather again. Late in the week, the southwesterly flow will not only lead to warmer times but also more humid times, which, in turn, could trigger afternoon shower development. Overall, air quality levels during the period are likely to continue to follow the trend of temperatures. Early on, as the cold front pushes through, air quality levels will stay in the good range. As the warmth and humidity return by mid week, expect air quality levels to rise back into the moderate category. This new air mass will remain in place until the next frontal system pushes through over the weekend. --Nolan

Current Conditions
Air Quality Index (AQI)
observed at 7:00 EDT
56
Moderate
Health Message: Unusually sensitive people should consider reducing prolonged or heavy exertion.
AQI - Pollutant Details
Particles (PM2.5) 56 Moderate
Ozone 13 Good

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