* WHAT. Heat index values up to 100 expected. * WHERE. Portions of northern Delaware, central, northern, and southern New Jersey, and southeast Pennsylvania. * WHEN. From 9 AM this morning to 9 PM EDT this evening. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses.

The Maryland Department of the Environment has issued a Code Orange Air Quality Action Day for Ground Level Ozone, until midnight EDT Wednesday night. An Air Quality Alert means that air quality within the region may approach or exceed unhealthy standards. For more information on ground-level ozone and fine particulates, visit http://www.mde.maryland.gov/programs/air.

The Maryland Department of the Environment has issued a Code ORANGE Air Quality Alert Wednesday for Northeast Maryland. 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. For more information on ground-level ozone and fine particles visit the web site mde.maryland.gov/programs/air/AirQualityMonitoring/Pages/index.aspx.