Radon can not be seen, smelled, felt, or otherwise identified, aside from with a test. That's why, according http://marioqsvu779.yousher.com/getting-a-home-with-radon-what-you-should-know to the EPA, the only means to recognize for certain if you have a radon problem is to test.

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.

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