Odakyu Hakone

Hakone Ropeway

Cautions and safety measures

Find information on Owakudani's volcanic gas, cautionary warnings and safety measures.

  1. TOP
  2. About volcanic gas
  3. Cautions and safety measures

What is volcanic gas?

The main components of the volcanic gas are water vapor, carbon dioxide, and also sulfur dioxide (sulfurous acid gas). Usually small amounts of hydrogen gas, carbon monoxide, hydrogen sulfide, and hydrogen chloride are present. Some volcanoes may include hydrogen fluoride, silicon tetrafluoride, methane, ammonia, carbonyl sulfide, helium, radon, and mercury vapor, etc. These gases can cause great harm to animals and plants due to the toxic components and oxygen deficiency, and in many cases there is a large influence on the surrounding ecology due to the heat. At Hakone Ropeway, we constantly measure the gas concentration and operate in a way that ensures that our customers can enjoy the ropeway in safety.


Due to the influence of the volcanic gases, the ropeway is dangerous for the following types of customers, so they cannot board the ropeway between Sounzan Station and Ubako Station. Depending on the concentration of the volcanic gases, operation may be suspended on all lines.

  • Persons with allergic asthma

  • Persons with bronchial disease

  • Persons with respiratory (pulmonary) disease

  • Persons with heart disease

  • Persons wearing a cardiac pacemaker

  • Persons in poor physical condition

Also, although it is rare, the volcanic gas may cause seizures such as asthma in highly sensitive persons (including pregnant women, newborns and toddlers), persons with an allergic constitution, etc, and elderly persons, so please consider carefully whether you wish to ride the ropeway.

  • Pregnant women

  • Newborns and toddlers

  • The elderly

safety measures

For customers who board the ropeway between Sounzan Station, Owakudani Station, and Ubako Station, we have prepared the following:

  • Wet hand towels
    disposable item for covering mouth and nose

  • Four-language passenger pamphlet
    describing how to use the wet hand towels

  • A box with a first-aid kit is stored inside the gondola.
    Contains oxygen and wet hand towels.

  • First-aid centers are at all stations.