Radon.
D000393:Air Pollutants / Q000633:toxicity*; D000818:Animals; D004781:Environmental Exposure; D006801:Humans; D008175:Lung Neoplasms / Q000209:etiology*; D008906:Mining; D009381:Neoplasms, Radiation-Induced / Q000209:etiology*; D011829:Radiation Dosage; D011886:Radon / Q000633:toxicity*
D000393:Air Pollutants; D011886:Radon