The Pennsylvania Department of Environmental Protection has issued a "code orange" air quality alert for the Liberty/Clairton area for Monday.
A "code orange" means that air pollution concentrations within the region may become unhealthy for sensitive groups such as children, the elderly, and people suffering from asthma, heart disease, or other lung diseases.
The EPA recommends people in those groups reduce prolonged or heavy outdoor exertion, plan for less intense activities, take more breaks and spend time outdoors in the morning, when ozone levels tend to be lower. They also should watch for symptoms such as coughing or shortness of breath.