Atmospheres are found not only on Earth, but on most stars of a certain size. However, the only atmosphere that humans can breathe is the air on Earth.
Earth's air is a mixture of several gases. Of these gases, nitrogen and oxygen make up most of the air, with these two alone making up 99%. Although there are other gases in the air, they are all present in very small quantities, so it is best to remember that air is composed of nitrogen and oxygen.
Of these two gases, oxygen was not originally present in the Earth's air, but was created later. Oxygen was created by plants.
Life was born on the earth, and out of that life, a creature was born that received sunlight and converted carbon dioxide into oxygen. That is plants.
The earth's air is something that was progressively changed by the creatures of the earth. Therefore, no other planet has the same air as the Earth.