 According to DENREC, air pollution concentrations may become unhealthy for children, people with asthma, heart disease, or lung diseases, as well as the elderly. In Sussex County, officials have designated several cooling stations that will be open to the public through Wednesday. They include several library branches, as well as the Sussex County Administration Building on the Circle in Georgetown. Water also will be available. If you're in Kent or Newcastle counties, libraries also are a good spot if you need to find a place to cool down.