The recent increase in seismic activity at Mount Redoubt on the western side of Cook Inlet led the state of Alaska Department of Health and Social Services to issue a reminder of the possible health effects that can be caused by a volcanic eruption and associated ash fall.

Located 100 miles southwest of Anchorage, the volcano has been more active than normal in the past weeks, leading the Alaska Volcano Observatory to warn residents on Jan. 25 that Redoubt may erupt within "hours or days."

Mount Redoubt last erupted in 1989, spewing volcanic ash to a height of 14,000 feet and spreading ash into the Anchorage Bowl and the Matanuska Valley, covering an area of 7,700 square miles.

State officials warn the severity of respiratory problems resulting from inhaling volcanic ash depend on factors such as the size and concentration of particles in the air. Most symptoms are considered to be short-term problems that are not harmful for people without pre-existing respiratory conditions, according to department spokesman Greg Wilkinson.

Symptoms might include nasal irritation and excessive mucous; throat irritation and dry cough; discomfort while breathing; and airway irritation, especially for people with asthma or bronchitis.

The warning suggests people with pre-existing respiratory conditions remain inside and use a dust mask.

In addition to potential breathing problems, Wilkinson warned of potential eye irritation that could occur as a result of the ash fall.

"People, especially those who wear contact lenses, could experience eye discomfort," he said. "Signs and symptoms of an eye problem include a feeling like something is in the eye, painful, itchy, bloodshot eyes or excessive tearing."

Additionally, the warning said, if there's ash fall, people should close windows, doors and fireplace/woodstove dampers to prevent ash from getting inside the home.

The use of an N-95 disposable respirator or dust mask, as well as safety goggles, is recommended while outdoors or while cleaning up ash.

When cleaning up ash fall, the state recommends wetting the ash lightly prior to cleanup to avoid stirring up particulates.

Wilkinson suggested people seek immediate medical attention if substantial respiratory or eye symptoms develop.

In the case of a sizeable eruption, the state Division of Homeland Security and Emergency Services along with the Department of Health and Social Services, the Department of Environmental Conservation, the National Oceanic and Atmospheric Administration and the Alaska Volcano Observatory will issue regular alerts and specific recommendations for impacted communities.

For more information on the status of Alaska volcanoes go to the Alaska Volcano Observatory Web site at www.avo.alaska.edu.

Reach the reporter at editor@alaskastar.com.