peak flow higher at work : Asthma

So I have been suffering asthma like symptoms for 2.5 months after covid. I had one pft test November 28th and passed so they said no asthma. I’m going to another pulmo the 27th for another test. Anyway. I have been taking peak flow measurements. At home it averages 500-530. At work It averages 530-550. I was thinking maybe I had a nice air filter at work perhaps or in fact I do have asthma hence the lower number at home from idk mold or something??

Thanks

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