Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

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 - NH3 - Concentration in Air and Health Effectscaption
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

  • Air Conditioning Systems

    Design of Air Conditioning systems - heating, cooling and dehumidification of indoor air for thermal comfort.
  • Physiology

    Human physiology vs. air quality, comfort temperatures, activity and metabolic rates. Health effects of gases adn polutions like carbon monoxide and more.

Related Documents

Search

Search is the most efficient way to navigate the Engineering ToolBox.

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 - enabled for use with older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

Translate this Page

Translate this page to Your Own Language .

About the Engineering ToolBox!

Privacy Policy

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .

Citation

This page can be cited as

  • The Engineering ToolBox (2005). Ammonia - NH3 - Concentration in Air and Health Effects. [online] Available at: https://www.engineeringtoolbox.com/ammonia-health-symptoms-d_901.html [Accessed Day Month Year].

Modify the access date according your visit.

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Unit Converter

















































3.27.8

.