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DEP Issues Code Orange Air Quality Action Day Forecast for Ozone for Tuesday, July 9, 2024, for the Philadelphia and Susquehanna Valley areas in Pennsylvania


Harrisburg, PA – The Pennsylvania Department of Environmental Protection has forecast a Code ORANGE Air Quality Action Day for ozone for Tuesday, July 9, 2024, for the Philadelphia and Susquehanna Valley areas in Pennsylvania. For the Philadelphia area, this includes the counties of Philadelphia, Bucks, Montgomery, Delaware, and Chester. For the Susquehanna Valley area, this includes the counties of Cumberland, Dauphin, Lebanon, Lancaster, and York.

Mostly sunny skies and temperatures in the middle to upper 90s should create conditions for robust ozone development and formation into the code ORANGE range during the afternoon hours.

The U.S. Environmental Protection Agency’s 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 issued when the AQI is forecasted to be code orange or higher. On air quality action days, 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(s) are strongly encouraged to voluntarily help reduce air pollution by:

  • Conserving electricity by setting air conditioning to a higher temperature;
  • Combining errands to reduce vehicle trips;
  • Limiting engine idling; and
  • Refueling cars and trucks after dusk.

For more information, visit DEP at, or EPA’s AirNow website at

For more information on the Pennsylvania Department of Environmental Protection, please visit the website, or follow DEP on Facebook, Twitter, or LinkedIn.


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