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Who is at risk?

Chlorine is widely used as a powerful disinfectant in water treatment plants and sewage treatment works.

It is also used as a common bleaching agent in many manufacturing industries – particularly in the production of paper and plastics.


Bleach-like odour


Chlorine is very toxic in both gas and liquid form. When in contact with moisture, hydrochloric acid is formed which is highly corrosive and damaging to the eyes, throat and lungs.

Acute Exposure

Concentration Effect
1–3 ppm Mild irritation to eyes nose and throat
3-5 ppm Stinging or burning in eyes, nose and throat
5-10 ppm Severe irritation of the eyes, nose and throat
50 ppm Immediate difficulty breathing
400 ppm Lethal after 30 minutes
1000 ppm Fatal after a few breaths

Exposure Controls & Protection

Leak Detection & Monitoring

Instrumentation is the most reliable and accurate method for Chlorine leak detection. Leak detectors can be integrated into an alarm system for 24 hour monitoring.

NFPA 704 Signal

  Hazard Value Description
Health 4 Can be lethal.
Flammability 0 Will not burn under typical fire conditions.
Instability 0 Normally stable, even under fire conditions
Special OX Possesses oxidizing properties