How fast can a speedster run without creating damaging air pressures and wind?

It's no secret that super-speed comes with a slew of nigh-mystical secondary powers to protect both the speedster and their surroundings. There are common exceptions when writers want the speedster to dish out damage, but there are also nearly universal rules like abolishing conservation of momentum so that city roads aren't regularly destroyed by footsteps.

One aspect I haven't heard much about though is the speedster's lack of effect on air. Like how a moving car generates wind that can be felt by passers-by, a speedster should not be able to run closely by other people without them even noticing. If we do not hand-wave this away with yet another speedster perk, how fast CAN a speedster go before they injure or push people just with air pressure and wind? Analogies by real-world examples of fast objects are welcome.

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How fast can a speedster run without creating damaging air pressures and wind?

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