The ability to test materials in a multitude of natural environments can provide valuable information for determining the range of conditions under which those materials can be effectively used and maintained.  In addition to marine, rain forest, frozen alpine, industrial, desert and agricultural environments, Hawaii’s youngest volcano Kilauea offers an active volcanic environment.  A corrosion test site is located on an old Kilauea lava flow in Volcanoes National Park on the Big Island of Hawai’i.  At an elevation of 1,800 feet above sea level and approximately 5 miles downwind of the active cinder-and-spatter cone of Pu`u `O`o, this is a particularly harsh environment.  Sulfur dioxide and hydrogen sulfide gasses as well as other pollutants such as selenium, mercury, arsenic, and iridium, emitted from the volcano react with oxygen and atmospheric moisture to produce volcanic smog (vog) and acid rain.  The pH of rainwater collected at the site over a ten month period ranged from a low of 3.1 to a high of 3.8.  In addition to gaseous volcanic emissions, specimens at this site are exposed to chlorides from two likely sources; first, from sea spray by wave action, and second, from the acidic steam plume (laze) resulting from the boiling of sea water by hot lava entering the ocean approximately 5 miles to the east.  The molten lava, which reaches the ocean via underground lava tubes, reacts with seawater to create large steam plumes containing hydrochloric acid.  Atmospheric data such as temperature, humidity, rainfall, solar radiation, short-wave radiation, wind speed, wind direction and time-of-wetness are collected.  Chloride candles and silver coupons are used to measure chloride and sulfur deposition rates.  Rainwater is collected and then analyzed using an ion chromatograph.  A number of corrosion studies are ongoing at this location.