Pennsylvania DEP Declares Code Orange Air Quality Alert for Ozone Due to High Temperatures

The Pennsylvania Department of Environmental Protection (DEP) has issued a Code Orange Air Quality Alert for ozone for Friday, July 3, 2026, affecting Dauphin, Cumberland, Lebanon, Lancaster, York, Philadelphia, Bucks, Montgomery, Chester, and Delaware counties. High temperatures of 100-103°F and abundant sunshine are expected to lead to rapid ozone development. Sensitive groups, including children, older adults, and those with respiratory conditions, are advised to avoid heavy outdoor activity.