Hawaii Volcanic Gases and Ash - 23 of 22
Hawaii Volcanic Gases and Ash FAQs - 22 Found
Hawai`i Volcanoes National Park monitors SO2 and vog within park boundaries and issues air quality advisories or mandates closures if necessary. Roads and trails downwind of and leading to Halema`uma`u Crater were closed by park officials in February 2008 when SO2 emissions reached levels that became potentially hazardous to human health. Most areas have been re-opened but may be closed if conditions become unsafe.