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The International Volcanic Health Hazard Network (IVHHN) in cooperation with USGS, has released "The Health Hazards of Volcanic and Geothermal Gases: a Guide for the Public." The 20-page booklet addresses health hazards and impacts of volcanic and geothermal gases and aerosols.
It also documents protective actions to take when visiting or living in these environments. Information was reviewed by health and science professionals from 6 countries and is applicable to volcanic and geothermal environments. The booklet is 4th in a series of IVHN products providing hazard information to the public and emergency managers. The document is available for download here.