Some gases inside the air originate from volcanic eruptions. Volcanic eruptions eject gases from the inside of Earth. The most typical gas emitted by volcanoes is h2o vapor. Other gases, for instance carbon monoxide and sulfur dioxide, are poisonous to most organisms. [ I/T ] to Enable air from outside https://air-conditioning-systems57789.thechapblog.com/36454761/a-secret-weapon-for-air-conditioning-systems