The state Department of Environmental Protection issued an air quality alert for Friday, warning that some people may be affected by high particulate matter.

The DEP warned that sensitive groups — including the very old and very young, as well as those with medical conditions —  should avoid strenuous outdoor activity, because ozone levels in the air are expected to reach dangerous levels throughout the state.

The agency is also asking that residents and businesses across New Jersey avoid activities that could add to air pollution, such as vehicle use, lawn mowing, painting and wood burning.

The National Weather Service in Mount Holly is forecasting a sunny day Friday with temperatures around 90. Some rain is forecast for Monday, Labor Day, but Saturday and Sunday look clear with highs in the low-to mid-80s.

For more information on the air quality in the state, see: http://www.airnow.gov/index.cfm?action=airnow.local_state&stateid=31.