Radon can not be seen, smelled, felt, or otherwise identified, other than what are the side effects of radon gas exposure with an examination. That's why, according to the EPA, the only means to know without a doubt if you have a radon problem is to examination.
Does opening windows reduce radon?
Opening windows improves air circulation and ventilation, helping move radon out of the house and mixing radon-free outside air with indoor air. Opening basement windows helps reduce negative air pressure, diluting radon with clean outdoor air.