Ojos del Salado is an active volcano, but the question of whether it should be considered currently (or historically) active is arguable. According to the Smithsonian Institution's Global Volcanism Program, the most recent known eruption was about 1,300 years ago, with a large margin of uncertainty. However, there is also some evidence for a minor ash emission in 1993, which would definitely qualify the volcano as historically active. The presence of fumaroles high on the mountain and recent-looking lava flows, albeit of uncertain age, also argues in favor of a categorization as active. By these definitions, Ojos del Salado is the highest historically active volcano on Earth. If the older date is accepted, the title of highest historically active volcano might reside instead with the somewhat lower Llullaillaco volcano, which certainly has erupted in historic times (most recently in 1877) and is considered active.