Hawaii Volanoes National Park on the Big Island has been closed until further notice because of high sulfur dioxide levels.
Sulfur dioxide, an invisible gas that is being emitted from Kilauea volcano, can aggravate pre-existing heart and breathing problems such as asthma, emphysema and bronchitis, according to the Hawaii Department of Health.
The Hawaii County Civil Defense Agency issued an emergency health advisory for Mauna Loa Estates, Ohia Estates, Volcano Village, Keauhou Ranch area and Volcano Golf Course Subdivision as well as Royal Hawaiian Estates and Hawaiian Orchid Isle Estates.
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http://www.bizjournals.com/pacific/stories/2008/04/07/daily19.html