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
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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 as of 1 PM on Thursday: Mid and high level clouds combined with a little smoke from the wildfires in western Canada are giving the sky a hazy look today. Disturbances tracking along a stationary boundary to our south will bring slight chances for scattered showers Friday and Saturday before we see influence from an area of high pressure Sunday and into early next week. *** Friday’s Forecast: A disturbance moving along the stationary boundary that is presently set up to our south will bring some cloud cover and a chance for a few scattered showers, mainly later in the day, to the region on Friday. A northerly breeze, turning easterly as the day progresses, will help to push PM-2.5 concentrations back closer to the good range. Most locations could end up in the higher end of the good range on average for the day with a few scattered low moderate readings possible. The cloud cover and northerly to easterly breeze will help to limit ozone to the good range. *** Saturday’s Forecast: A slight chance for scattered showers will continue into at least early Saturday with winds a bit lighter than on Friday. A mix of sun and clouds will continue to limit ozone to the good range. The light winds leading to a limited amount of mixing, a slight rise in moisture levels, and contributions from holiday celebrations around the region will keep PM-2.5 concentrations in the high good to low moderate range for the day. Highs will be near seasonable levels as temperatures approach the low 80s. *** Sunday’s Forecast: An area of high pressure will build over the region for Sunday. Mostly sunny skies will allow for ozone concentrations to climb a little higher than Friday and Saturday, but are not expected to reach moderate levels until Monday. Light winds will continue to provide a limited amount of mixing, which will allow for PM-2.5 concentrations to continue remaining in the low moderate range. *** Monday’s Forecast: High pressure leading to mostly sunny skies and winds a light southerly breeze will push both PM-2.5 and ozone concentrations well into the moderate range. Highs will return to slightly above average values with temperatures peaking in the upper 80s. *** Extended Outlook: The computer models have been trending toward holding off a cold front approaching the region until later in the week now. For the past few days, this front had looked to arrive around Tuesday. If, over the course of the weekend, this trend returns to a frontal passage earlier in the week we could see an improvement in air quality conditions earlier in the week than if the front ends up arriving late week. With a slower arrival of the front, conditions could continue to be favorable on Tuesday for moderate PM-2.5 and moderate ozone if the cloud cover stays to the west long enough. Clouds should begin to return Tuesday afternoon at the earliest and Thursday morning at the latest. Ozone will return to the good range with the cloud cover and increase in chances for precipitation with PM-2.5 levels likely to remain moderate until the passage of the front. Temperatures will range from the low to upper 80s for most of the week. --- Roble

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