This specification establishes the requirements for breathing
a i r that i s supplied i n a pressurized container or d i r e c t l y from a compressor
The composition of the breathing a i r i s s i m i l a r to that normally found i n the
atmosphere. This specification does not apply to compressed a i r that i s used
i n manufacturing plants for i n d u s t r i a l purposes (see 6.1).