AMMONIA (NH3)

Colorless combustible toxic gas with a characteristic pungent smell
Lighter than air, density = 0,73 kg/m3
Lower explosive limit (LEL) = 15 %vol
Health exposure limits (Directive 2000/39/EC):
8 hours TWA = 20 ppm (14 mg/m3)
15 mins STEL = 50 ppm (36 mg/m3).