The viral particles does not float in the air forever. The infected guy has to be right up coughing in ur face for u to get it . And being in close contact does not 100% guarantee u will get it .

Not he cough at 10am, then u walk past at 1030am and breathe in the air. No u wont get it.

U guys should not be overparanoid.  Its been already more than a year since covid started. If its so easy to get, u guys would have gotten it long long time ago .