That means air is unhealthy for sensitive groups.
The Maryland Department of the Environment has issued a Code ORANGE Air Quality Alert Friday for the Maryland Piedmont region. A Code Orange Air Quality Alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children, people suffering from asthma, heart disease or other lung diseases and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors. By The National Weather Service, Sterling, Va.