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Why are some roads and trails in Hawai`i Volcanoes National Park closed?

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.

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Tags: Geothermal Resources, Earthquakes, Tectonics, Monitoring, Volcanoes, Seismicity, Ring of Fire