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.
Data Not Available
AQI - Pollutant Details
Particles (PM2.5)
Data Not Available
Forecast Discussion: Current Conditions: As of 2 PM on Monday, partly cloudy skies prevail over the region as high pressure remains in control of the weather. This area of high pressure, which was moving from west to east across the Great Lakes all weekend, has finally moved to a position in the New England states / eastern Canada. The clockwise flow around the high is keeping our winds out of the east today. The easterly flow is forcing some downsloping (off the Laurel Highlands) to occur, which is why temperatures have warmed into the upper 40s. The combination of increasing warmth and light wind flow has forced PM 2.5 levels to climb well into the moderate range today. Expect moderate conditions to continue to persist tomorrow as more moisture moves into the region. *** Tuesday's Forecast: So for Tuesday, expect the skies to turn mostly cloudy as the area of high pressure, which was off to our north on Monday, moves out to sea. At the same time, a new storm system will begin to take shape over the Midwest / west Ohio River region. This system will allow moisture to stream northward ahead of it as the winds turn southerly. The moderate southerly flow will, in turn, keep conditions warm and humid. In fact, high temperatures will peak in the low to mid 50s. The combination of the warmth and more humid conditions will help keep PM 2.5 level within the moderate range. With the winds increasing during the afternoon, expect PM 2.5 to only rise to the lower end of that range. *** Extended Outlook: Over the coming days, expect temperatures to remain warm early on as the storm system, which began to develop on Monday into Tuesday over the Midwest, continues to strengthen. This will create more winds and even more warmth over the area (temperatures are likely to approach the 60 degree mark on Wednesday). As the low track off to our north and east on Christmas, a cold front will push through our area, dropping temperatures a good 20+ degrees from Wednesday's highs. This will be a short-lived cold snap though as a new storm system begins to take shape over the Plains on Friday. This system along with an area of high pressure over the southeastern US will help drive warmer air back into the region on Friday. The main system will track through the Great Lakes on Saturday and allow a cold front to move through our area that day too. This will cool us off (at least driving temperatures toward more seasonable levels) enough for the possibility of two system to impact our region next week. Overall, air quality levels, after starting in the period in the moderate range are expected to bounce back to the good threshold on Wednesday and Thursday once the cold air moves in. A return to moderate conditions is likely when the warmer air moves in at the end of the week. --Nolan

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