* WHAT. Dense fog will reduce visibility to 1 NM or less. * WHERE. Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm. * WHEN. Until 10 AM EDT Monday. * IMPACTS. Low visibility will make navigation difficult.

* WHAT. Dense fog will reduce visibility to 1 NM or less. * WHERE. Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm. * WHEN. Until 10 AM EDT Monday. * IMPACTS. Low visibility will make navigation difficult.

The New York State Department of Environmental Conservation has issued an Air Quality Health Advisory for the following counties: New York, Bronx, Kings, Queens, Richmond, Westchester and Rockland, from 11 AM this morning to 11 PM EDT this evening. Air quality levels in outdoor air are predicted to be greater than an Air Quality Index value of 100 for the pollutant of Ground Level Ozone. The Air Quality Index, or AQI, was created as an easy way to correlate levels of different pollutants to one scale. The higher the AQI value, the greater the health concern. When pollution levels are elevated, the New York State Department of Health recommends that individuals consider limiting strenuous outdoor physical activity to reduce the risk of adverse health effects. People who may be especially sensitive to the effects of elevated levels of pollutants include the very young, and those with preexisting respiratory problems such as asthma or heart disease. Those with symptoms should consider consulting their personal physician. A toll free air quality hotline has been established so New York residents can stay informed on the air quality situation. The toll free number is 1 800 5 3 5, 1 3 4 5.

Patchy sea fog this morning is reducing visibilities along the coast to less than one mile at times. Be prepared for rapid changes in visibility over short distances! Turn on your low-beam headlights and leave extra space between you and the vehicle in front of you. Fog is expected to dissipate by mid-morning.

* WHAT. Heat index values up to 101 expected. * WHERE. Bronx, Kings (Brooklyn), New York (Manhattan), Northern Queens, Richmond (Staten Island), and Southern Queens Counties. * WHEN. From noon today to 8 PM EDT Tuesday. * IMPACTS. High temperatures and high humidity may cause heat illnesses.

* WHAT. Heat index values up to 103 expected. * WHERE. Eastern Bergen, Eastern Essex, Eastern Passaic, Eastern Union, Hudson, Western Bergen, Western Essex, Western Passaic, and Western Union Counties. * WHEN. From noon today to 8 PM EDT Tuesday. * IMPACTS. High temperatures and high humidity may cause heat illnesses.

* WHAT. Dense fog will reduce visibility to 1 NM or less. * WHERE. Sandy Hook NJ to Fire Island Inlet NY out 20 nm. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Low visibility will make navigation difficult. * ADDITIONAL DETAILS. The fog may persist through the day.

* WHAT. Heat index values up to 105 expected. * WHERE. Atlantic, Cumberland, and Salem Counties. * WHEN. From 10 AM this morning to 8 PM EDT Tuesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS. Peak heat indices on Wednesday are forecast to reach or exceed 100 degrees, and therefore an extension of this heat advisory into Wednesday is possible.

* WHAT. Heat index values up to 104 expected. * WHERE. In New Jersey, Morris, Sussex, Warren, and Hunterdon Counties. In Pennsylvania, Berks, Lehigh, Northampton, Upper Bucks, Western Chester, and Western Montgomery Counties. * WHEN. From 10 AM this morning to 8 PM EDT Tuesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS. Peak heat indices on Wednesday are forecast to reach or exceed 100 degrees, and therefore an extension of this heat advisory into Wednesday is possible.

* WHAT. Heat index values up to 104 expected. * WHERE. Portions of northern Delaware, central, northern, and southern New Jersey, and southeast Pennsylvania. * WHEN. From 10 AM this morning to 8 PM EDT Tuesday. * IMPACTS. Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS. Peak heat indices on Wednesday are forecast to reach or exceed 100 degrees, and therefore an extension of this heat advisory into Wednesday is possible.

* WHAT. Dense fog will reduce visibility to 1 NM or less. * WHERE. Coastal waters from Sandy Hook to Manasquan Inlet NJ out 20 nm and Coastal waters from Manasquan Inlet to Little Egg Inlet NJ out 20 nm. * WHEN. Until 10 AM EDT Monday. * IMPACTS. Low visibility will make navigation difficult.

The Pennsylvania Department of Environmental Protection has issued a code orange air quality alert Monday for The Lehigh Valley/Berks County area. 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 http://www.depweb.state.pa.us

The Delaware Valley Regional Planning Commission has issued a code orange air quality alert Monday for The Philadelphia Metro area. 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 http://www.phila.gov/health/units/ams/