Radon can not be seen, smelled, felt, or otherwise discovered, aside from with an examination. That's why, according to the EPA, the only means to recognize without a doubt if you have radon poisoning symptoms in humans a radon issue 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.