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: This Weekend's Air Quality Forecast: On Saturday, partly sunny skies will persist over the region as the area of high pressure, which was off to our west for much of the day on Friday, shifts off to our east. As a result, the winds will switch more out of the southwest, allowing warmer air to build in. The wind shift coupled with the pockets of sunshine should help drive temperatures into the mid 40s. The warm air advection into the region is likely to create a limit in vertical mixing during the morning hours. Therefore, expect PM 2.5 levels to climb. The increase in winds during the afternoon should force PM 2.5 levels down but not low enough to drop the average for the day below the low moderate range. *** For Sunday, expect more clouds to move in over the region as a storm system, with origins over the southeastern US, moves northward across the Tennessee and Ohio River valleys. This system will have a wide swath of precipitation associated with it as it pushes northward. Expect some of that precipitation (in the form of rain) to make its way into our area late in the day. Overall, winds will continue to reside out of the south. The southerly winds will continue the warming trend over the region, forcing afternoon temperatures to peak in the mid 50s. The combination of the warm temperatures and increasing dewpoint temperatures (a measure of surface moisture) should be enough to hold PM 2.5 levels within the low moderate threshold. *** On Monday, overcast skies will prevail early in the day as even more rain moves in over the region. This rain, associated with an area of low pressure progressing northward from the Ohio Valley into the Great Lakes, is likely to die off by the mid-morning. By the afternoon, we could see some partial clearing as a cold front begins to advance into the Ohio Valley. The peaks of sunshine along with the southerly wind direction will help drive temperatures into the low 60s. The warm and moist air mass will be enough to keep PM 2.5 levels hovering in the low moderate range. *** Extended Outlook: As we take a peek into next week, we notice that the week will start off the seasonably warm side as a departing area of high pressure turns our winds out of the south, advecting in warmer air from the southeastern US. This warmup will be short-lived however, thanks to the passage of a cold front on Tuesday. Once the cold front pushes through, expect a colder and drier air mass to build into the region. These conditions are likely to continue into the Thanksgiving holiday as an area of high pressure over the Plains keeps the winds out of the north and west and the air mass flowing in from Canada. By the end of the week, the area of high pressure will have migrated to a position along the East Coast. This positioning of the high will help moderate temperatures as we head into the weekend. Overall, air quality levels are expected to be at their highest in the early and late portions of the week. Overall, expect levels to not rise out of the good and moderate categories during the period. --Nolan

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