wˈʌn pˌɑːsəbˈɪlᵻɾi ɪz tə tˈeɪk nˈaɪtɹədʒən ænd ˈɑːɹɡɑːn fɹʌmðɪ ˈætməsfˌɪɹ ʌv mˈɑːɹz; haʊˈɛvɚ, ðeɪ ɑːɹ hˈɑːɹd tə sˈɛpɚɹˌeɪt fɹʌm ˈiːtʃ ˈʌðɚ.
One possibility is to take nitrogen and argon from the atmosphere of Mars; however, they are hard to separate from each other.