Doctor Who: Before the Beginning or Giants of Eternity
"they breathe carbon monoxide or something?" "no, yaz... the air's a fairly common oxygen-nitrogen mix; a bit more oxygen than you'd get on earth but it's still ... wrong." she tapped a small screen.
Episode 23: Survival Instincts
Scans showed no presence of carbon monoxide or any other off-gassing that could prove dangerous. “this is going to feel so good!” o’mara sighed as she pulled her tunic off. rivas just grunted. his attention was on the tent.