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To answer the question, pure ammonia has a density of ~0.7-0.9 g/L, depending on temperature. The density of air is ~1.2 g/L, again depending on temperature and pressure. So, yes, ammonia gas is lighter than air in terms of density. 3 people found this useful.
A common statement heard from growers is âI have a little. ammonia in my house but itâs not bad.â The truth of the matter is that at levels of. 50 ppm ammonia or lower, most growers are not able to smell harmful levels of am-. monia in the house. Theoretically, the human nose can detect ammonia at around. 20 ppm.