HARRISBURG, Pa., (WHTM) — The Pennsylvania Department of Environmental Protection (DEP) has declared a Code Orange Air Quality Action Day for fine particulate matter for Friday, Dec. 30.

This includes Cumberland, Dauphin, Lancaster, Lebanon, and York.

The DEP has said an overnight and morning temperature inversion and light winds will likely contribute to daily average concentrations of fine particulate matter in the Code Orange range on Friday.

The United States Environmental Protection Agency Air Quality Index provided color codes for forecasting and reporting air quality:

  • Green: No health impacts are expected
  • Yellow: Extremely sensitive people may wish to limit outdoor exertion
  • Orange: Unhealthy pollution levels for sensitive groups of people.
  • Red: Everyone should limit exertion outdoors

According to the DEP, residents, and businesses within the Air Quality Action Day areas 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.