Air Mixing with IV Fluids and Injection?

PEDICARE, Ranchi, India.
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In our day to day practice we come across situations when air comes in contact with IM/IV injections/vaccines being given to a patient/a vaccine recipient or IV fluids in which air enters into the saline bottles. Surprisingly we don’t get any finding of subsequent infection in the recepient. Why is it so? As because we have to use sterile water for injection for preparing parental injections/ vaccines but not sterile air. I would like to know the reason behind sterility of air entering into IV/IM injections.