ATEX Zone

An ATEX zone is a defined area where explosive atmospheres may occur due to the presence of flammable gases, vapours, or combustible dust. The term “ATEX” originates from the French Atmosphères Explosibles and refers to two European Union directives (Directive 2014/34/EU and Directive 1999/92/EC) that govern equipment and workplace safety in potentially explosive environments.

ATEX zoning categorises areas based on the frequency and duration of the presence of explosive substances:

• Zone 0 / Zone 20: Explosive atmosphere is present continuously or for long periods.
• Zone 1 / Zone 21: Likely to occur in normal operation occasionally.
• Zone 2 / Zone 22: Unlikely to occur or only for a short duration.

Equipment and protective systems used in these zones must be certified and clearly marked to indicate compliance with ATEX requirements. Risk assessments and appropriate installation practices are essential to minimise ignition sources, protect personnel, and ensure operational safety.

ATEX compliance is critical in industries such as oil and gas, chemical manufacturing, food processing, and mining, where explosive atmospheres can arise in day-to-day operations.

See also: Safety Standards, Safety Observation, Construction Site Monitoring