* WHAT. Visibility down to a quarter of a mile in dense fog. * WHERE. Rush, Monroe, Brown, Bartholomew, Decatur, Lawrence, Jackson and Jennings Counties. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Hazardous driving conditions due to low visibility.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. Portions of east central and southeast Indiana, northeast and northern Kentucky and central, south central, southwest and west central Ohio. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Hazardous driving conditions due to low visibility.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. Portions of east central and southeast Indiana, northeast and northern Kentucky and central, south central, southwest and west central Ohio. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Hazardous driving conditions due to low visibility.

* WHAT. Visibility down to a quarter of a mile in dense fog. * WHERE. Johnson and Shelby Counties. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Hazardous driving conditions due to low visibility.

* WHAT. Visibility down to a quarter of a mile in dense fog. * WHERE. Rush, Monroe, Brown, Bartholomew, Decatur, Lawrence, Jackson and Jennings Counties. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Hazardous driving conditions due to low visibility.

Fog and low clouds will continue to develop early this morning. Visibilities are expected to range from one half of a mile to 2 miles across most locations, but localized areas may experience visibilities of one quarter of a mile or less. The greatest threat of widespread dense fog this morning is across extreme northeast Indiana, far northwest Ohio, and south central Lower Michigan. If travelling this morning, be prepared for rapid changes in visibilities across short distances and leave extra distance between vehicles. The fog is expected to dissipate after 9 AM EDT this morning.

* WHAT. Visibility down to a quarter of a mile in dense fog. * WHERE. Putnam, Hendricks, Marion, Hancock, Henry, Owen, Morgan, Greene and Martin Counties. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Hazardous driving conditions due to low visibility.

* WHAT. Visibility down to a quarter of a mile in dense fog. * WHERE. Johnson, Shelby, Rush, Monroe, Brown, Bartholomew, Decatur, Lawrence, Jackson and Jennings Counties. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Hazardous driving conditions due to low visibility.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. Portions of east central and southeast Indiana, northeast and northern Kentucky and central, south central, southwest and west central Ohio. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Hazardous driving conditions due to low visibility.

* WHAT. Visibility one quarter mile or less in dense fog. * WHERE. Hardin, Darke, Shelby, Logan, Union, Delaware and Licking Counties. * WHEN. Until 10 AM EDT this morning. * IMPACTS. Hazardous driving conditions due to low visibility.

If traveling this morning, be prepared for areas of fog that could suddenly reduce visibilities to less than 1 mile. Locally dense fog with visibility of around a quarter of a mile is also possible. Fog will improve after 900 AM EDT. Slow down and allow extra time to reach your destination.

An Air Quality Action Day has been declared by the Indiana Department of Environmental Management for Saturday May 18th in portions of north-central and northwest Indiana. Ozone levels are expected to be in the Orange or unhealthy for sensitive groups range. People and businesses are urged to avoid activities which lead to ozone and fine particulate formation. These activities include. refueling vehicles or topping off when refueling, using gasoline powered lawn equipment and using charcoal lighter fluid. Positive activities include. car pooling, biking to work, delaying or combining errands and using water based paints. It is recommended that people with respiratory diseases such as asthma limit prolonged outdoor exertion.