The Pennsylvania Department of Environmental Protection declared Tuesday a Code Orange Air Quality Action Day for ozone in the Pittsburgh area, which includes Allegheny, Washington, Westmoreland, Fayette, Beaver, Butler and Armstrong counties.

An Air Quality Action Day is declared when the air quality index is forecasted to be Code Orange or higher. On an Air Quality Action Day, young children, the elderly and those with respiratory problems like asthma, emphysema and bronchitis, are especially vulnerable to the effects of air pollution and should limit outdoor activities.

Mostly sunny skies and high temperatures around 90 degree will likely contribute to eight-hour average concentrations of ozone in the Code Orange range on Tuesday.