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Smelling salts are a chemical compound that releases small amounts of ammonia gas, which essentially jump starts your bodyâs nervous system. The ammonia causes blood vessels in your nasal passages to expand providing an instant increase in oxygen to your brain meaning an instantaneous boost of alertness and power.
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.