Liberty/Clairton area
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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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Southwest PA Air Quality Partnership is undergoing maintenance. Updates for the forecasts and current conditions are not available between midnight and 4 am EST.

Air Quality Forecast
Today's High Tomorrow's High
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: The Weekend's Air Quality Forecast: On Saturday, mostly cloudy skies will persist over the region as the area of high pressure, which was off to our west on Friday, continues to push east across the northeastern tier states. The clockwise rotation around the high will continue to keep our winds out of the northwest during the day. The northwesterly winds will, in turn, keep conditions cold and dry. In fact, temperatures are only expected to make their way into the mid 30s. The combination of the cold conditions, more stability (due to the slow progression of the high closer to our area), and the light winds will keep the boundary layer more favorable for elevated PM 2.5 levels. Therefore, expect readings to rise toward the good / moderate threshold. *** For Sunday, mostly cloudy skies will once again be the rule as the area of high pressure (we have been contending with the past couple of days) continues to drive eastward toward the New England states. As a result, we will see another day where the winds are very light. The light winds coupled with the increasing warmth (at least aloft) will allow and inversion to form over the region. The inversion will enhance PM 2.5's ability to increase during the morning hours. As temperatures reach into the low 40s, expect PM 2.5 levels to rise well within the moderate range. *** On Monday, mostly cloudy skies will continue to prevail over the region as our area of high pressure begins to move out into the Atlantic. On the backside of the high, winds will turn more out of the south, allowing even warmer temperatures to build in. In fact, afternoon highs will peak in the upper 40s. At the same time, a storm system will push into the northern Plains. This system will impact us later in the week. In the meantime, expect the influx of warm and moist air into the area to keep the environment ripe for elevated PM 2.5 levels. *** Extended Outlook: As we take a peek into next week, we notice that week will start off on the unseasonably warm side. This will begin on Monday as an area of high pressure, which had been slowly moving east across the Northeastern US over the weekend, finally pushes out to sea. A new storm system over the Plains will take its place. This will set the stage for influx of warmer air for our area thanks to a wind switch out of the south. As the storm system from the Plains moves east, it will combine with a weak system over the southeastern US and create a very strong system over the Great Lakes. The intensity of the winds will be a direct correlation of how strong this system becomes. A lot of warm air will move northward in advance of this system. In fact, we could eclipse the 60 degree mark on Tuesday as the rain threat increases. It appears to be a very wet Wednesday as a cold front associated with this system pushes through our area. In comparison, Christmas Day will see temperatures fall back to normal as a strong storm system rotates over the Great Lakes. These temperatures are likely to be short-lived though as yet another storm system begins to take shape over Plains. Overall, due to the volatility in the weather beginning early in the week, air quality levels are expected to fall back into the good range after staying the weekend in the moderate category. --Nolan

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