Nature of the air inside buildings or enclosed areas, as determined by odour, smoke, humidity, air conditioning (controlled air quality) or uncontrolled air quality, and which may provide useful information about the world (e.g. smell of leaking gas) or distractions (e.g. overpowering smell of perfume).
Lower livel:
e2600w1 The work place has been closed, and air becomes foul easily with smoke and the gas, etc.
e2600w2 It stops smoking indoors due to the trachea trouble.