ɹˈeɪdɑːn əkˈɜːz nˈætʃɚɹəli æz ɐ ɹɪzˈʌlt ʌv dᵻkˈeɪ ʌv ɹˌeɪdɪoʊˈæktɪv ˈɛlɪmənts ɪn sˈɔɪl ænd ɪt kæn ɐkjˈuːmjʊlˌeɪt ɪn hˈaʊzᵻz bˈɪlt ˌɔn ˈɛɹiəz wˌɛɹ sˈʌtʃ dᵻkˈeɪ əkˈɜːz.
Radon occurs naturally as a result of decay of radioactive elements in soil and it can accumulate in houses built on areas where such decay occurs.