Behaviour in case of a chemical accident


A colourless, corrosive gas that is lighter than air and has a sharp, irritating smell (such as the spirit of ammonia). In the atmosphere, it forms a cold white fog cloud that stays on the ground. When warming, the gas cloud rises.


Toxic chemical concentration in air.

Health effects

Extremely irritating to the eyes and respiratory system. Causes tearing, nose irritation, a sore throat, cough, difficulties breathing, and chest pains; in the case of higher concentrations, also severe respiratory and lung damage, including pulmonary oedema, possible sudden death. Corrosive ammonium hydroxide, which damages the eyes and skin, is produced by reacting with moisture.


If you are outside, move perpendicular to the direction of the wind outside of the danger zone. Hide in confined spaces. If you are inside, close all doors, windows, and ventilation openings. Cover the airway, with a damp cloth if possible.

First aid

Move the injured person to an uncontaminated area with fresh air, remove contaminated clothing, flush the skin and eyes with running water for 20–30 minutes. In case of breathing difficulties, administer oxygen. Ensure peace and warmth. As the symptoms may appear later, the injured person will definitely need to be hospitalised!