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: None
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AQI - Pollutant Details
Particles (PM2.5)
Data Not Available
Forecast Discussion: Current Conditions: As of 2 PM on Thursday, overcast skies prevail over the region as a clipper system approaches PA. Right now, it remains dry as much of the rain has now moved east of our area. Current temperatures are hovering in the low 30s with dewpoints in the 20s. With the actual frontal system associated with the clipper still off to our west, we have seen southerly flow continue, which has helped to keep PM 2.5 levels within the moderate threshold. Expect better air quality to build in tomorrow as colder and drier air moves in. *** Friday's Forecast: So for Friday, expect cloudy skies to persist over the region as the clipper system, which was still over the Ohio Valley on Thursday, finally pushes through the region. As it moves through, we could experience an isolated snow shower. Once through, the winds will turn out of the northwest, which, in turn, will force colder and drier air southward across our region. Temperatures should peak in the 20s during the morning before falling into the 10s during the afternoon. The strong winds (which will help drive wind chills into the single digits) will provide an adequate mixing environment to drop PM 2.5 levels well within the good category. *** Extended Outlook: Over the coming days, expect temperatures to remain below seasonable levels as a series of storm systems impact the area. These colder temperatures are driven by the pattern that is taking shape over the northern Atlantic. A ridge of high pressure is going to be the dominant feature in the northern Atlantic Ocean as it begins to extend its influence into Greenland. This ridge has already begun to filter much of the colder air in the Northern Hemisphere into our side of the poll. Impulses of this cold, which is centered across eastern Canada, will infiltrate our area in the coming days. Overall back home, we will continue to see storminess as the pattern remains active. Once the clipper system moves off to our east, we will see a new area of high pressure build in over the Northeastern US. This high will move east during the weekend just as a new storm system takes shape over the central Plains (from an upper level disturbance moving out of the southwestern US). This storm system will spread east on Sunday into Monday and spread snow in its path. Once the storm moves off to our east, a new area of high pressure will build in over the Plains and deliver a reinforcing shot of cold air to our region through mid week. Overall, air quality levels are expected to be their highest on Sunday due to the combination of increasing humidity (with the approaching storm) and temperatures (in advance of the storm). Otherwise, levels should remain within the good range. --Nolan

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