Pure 100% oxygen itself is odorless and colorless. It does not have a distinct smell. The perception of smells typically arises from the presence of various chemical compounds in the air, and in the case of polluted air, these compounds can contribute to odors.
In our everyday environment, the air we breathe is a mixture of gases, with oxygen making up about 21% of the air composition. The remaining gases, such as nitrogen, carbon dioxide, and trace elements, contribute to the characteristic smell of our surroundings.
When breathing pure oxygen in a controlled environment, where other gases and pollutants are eliminated or minimized, you would not experience any specific odor associated with the oxygen itself. However, it's important to note that breathing pure oxygen for extended periods outside of a controlled medical setting can be harmful and should only be done under proper medical supervision.
It's worth mentioning that certain industrial or medical applications may involve the use of high-concentration oxygen, and in those cases, there may be additional scents associated with the equipment or any accompanying chemicals used in the process. But pure oxygen, in its natural state, does not have a detectable odor.