Air is a mixture because:-1. The components of air change from place to place. . 2. the individual parts of air display their own property.
3. Mixtures have a varying composition, show the individual chemical & physical props. of each component & in most cases, can be separated physically and so is for air as we can separate different gases of air through a physical process. 
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1]air is a mixture because air is mixture of various gases,water vapor,dust etc.2]all the constituents of air are mixed in an proportion and not in chemically bonded.3]As it also contains 78.084 percent nitrogen gas, 20.946 percent oxygen, 0.04 percent carbon dioxide so air is mixture of many gases.
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