Flammable Limits in Air: 15-28% (by volume)
PEL/TWA  35ppm
TWA 25ppm
TLV/IDLH  500ppm
NIOSH Ceiling  35ppm
CAS # 7664-41-7
Ammonia is a colorless, alkaline gas having a sharp pungent odor (at room temperature and atmospheric pressure). It dissolves readily in water. It is most often used in fertilizers but is also used in the manufacture of other chemicals and household and industrial cleaning solutions.