Harrisburg, PA – The Pennsylvania Department of Environmental Protection (DEP) has declared a Code Orange Air Quality Action Day for fine particulate matter (PM2.5) for Tuesday February 10, 2026, in the Liberty-Clairton Area of Allegheny County, which includes Clairton City, Glassport Borough, Liberty Borough, Lincoln Borough, and Port Vue Borough and in Dauphin, Cumberland, Lebanon, Lancaster, and York counties.
Persistent snow cover, light winds, and morning inversions will all act to produce Code Orange PM2.5 concentrations Tuesday.
Across the Liberty-Clairton area, air quality remains poor into the early afternoon when southwest winds will increase above 10 mph.
Across the Susquehanna valley, surface flow will remain light most of the day, with no significant increase in flow until a cold frontal passage Tuesday night.
Residents are encouraged to check www.airnow.gov for current conditions in their area.
Fine particulate matter (or PM-2.5) comes in many sizes and shapes and can be made up of hundreds of different chemicals. Some are emitted directly from a source, such as construction sites, unpaved roads, fields, smokestacks, or fires. Most particles form in the atmosphere as a result of complex reactions of chemicals such as sulfur dioxide and nitrogen oxides (called “precursors”), which are pollutants emitted from power plants, industries, and automobiles.
On a Code Orange Air Quality Action Day, young children, the elderly, and those with respiratory problems, such as asthma, emphysema, and bronchitis, are especially vulnerable to the effects of air pollution and should limit outdoor activities.
Residents and businesses within the Air Quality Action Day area are strongly encouraged to voluntarily help reduce fine particulate matter air pollution by:
- Reducing or eliminating fireplace and wood stove use
- Avoiding the open burning of leaves, trash, and other materials; and
- Avoiding the use of gas-powered lawn and garden equipment.
The U.S. Environmental Protection Agency’s (EPA) Air Quality Index (AQI) provides standardized color codes for forecasting and reporting daily air quality. Green signifies good air quality; Yellow means moderate air quality; Orange represents unhealthy pollution levels for sensitive groups of people; and Red warns of unhealthy pollution levels for all. An Air Quality Action Day is declared when the AQI is forecasted to be Code Orange or higher.
For more information, visit DEP at www.ahs.dep.pa.gov/AQPartnersWeb, EPA’s AirNow at www.airnow.gov, Allegheny County Health Department at www.alleghenycounty.us/airquality or Southwestern Pennsylvania Air Quality Partnership at www.spaqp.org.
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