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Ammonia - NH3 - Concentration in Air and Health Symptoms
Ammonia and health symptoms - smell and threat to life
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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) |
| 1,000 | Caustic to airway |
| 1,700 | Fatal after short exposures - less than half an hour |
| 5,000 | Immediate hazard to life |
| > 15,000 | Full body protection required |
| 160,000 - 170,000 | Flammable in air at 50oC |
- 1) ACGIH - American Conference of Industrial Hygienists
- 2) OSHA - Occupational Safety and Health Administration
Lower Flammable Limit (LFL) of Ammonia in air is 15-16% by volume.
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Related Topics
- Air Conditioning - Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort
- Physiology - Human physiology, air quality and comfort temperatures, activity and metabolic rates, health effects of carbon monoxide and more
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Related Documents
- Ammonia - NH3 - Properties - Thermodynamic properties - specific volume, enthalpy and entropy - of saturated and superheated ammonia
- Pressure and Temperature Chart of Ammonia - NH3 - A temperature (oF) and pressure (psia, psig) chart for Ammonia - NH3
