Ammonia - NH3 - Concentration in Air and Health Effects

Ammonia and health symptoms - smell and threat to life

Ammonia - NH3 - is a gas commonly used as a refrigerant in cooling systems.

The gas is colorless with very sharp odor. In small concentrations the gas is detectable by smell. In high concentrations the gas is an immediate hazard to life.

Ammonia concentration in air
(ppm)
Health Symptoms
< 25 Detectable by smell. Maximum Permissible Exposure Limit (PEL)1)
30 Uncomfortable, breathing support required. Maximum exposure 15 minutes1)
50 OSHA2) maximum exposure limit
100 Irritated eyes, throat and mucous membranes. Mild eye, nose, and throat irritation, may develop tolerance in 1-2 weeks with no adverse effects.
140 Moderate eye irritation, no long-term effect in exposures of less than 2 hours
400 Moderate throat irritation. Damage of mucous membranes with more than one hour exposure
500 Immediate danger to life limit (IDLH)
1000 Caustic to airway
1700 Fatal after short exposures - less than half an hour
5000 Immediate hazard to life
> 15000 Full body protection required
160000 - 170000 Flammable in air at 50oC

Lower Flammable Limit (LFL) of Ammonia in air is 15-16% by volume.

Related Topics

  • Physiology - Human physiology, air quality and comfort temperatures, activity and metabolic rates, health effects of carbon monoxide and more
  • Air Conditioning - Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort

Related Documents

Tag Search

  • en: ammonia nh3 health symptoms
  • es: síntomas de salud amoniaco NH3
  • de: Ammoniak NH3 Gesundheit Symptome

Search the Engineering ToolBox

- "the most efficient way to navigate!"

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your SketchUp model with the Engineering ToolBox - SketchUp Extension/Plugin - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Translate the Engineering ToolBox!
About the Engineering ToolBox!

close