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Well, I didn't mean literally that the air needs to be clean in term of physical impurities, although now that we talk about it, woodyracing is right. In terms of physical impurities, you don't want a whole lot of dirt cloggin up anything as this tends to increase the losses of the system. What I meant in terms of "clean air" was more in terms of how homogeneous your flow is. For example usually you don't want turbulent air as it tends to be rather messy, so part of the function of the air box is to straighten out the flow. This is also why the air box and in general anything that needs air flow (for say cooling purposes) is located somewhere where they can get "clean" air. This tends to increase the efficiency of the combustion, cooling, etc.
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