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Understanding ATEX Zones: Definitions, Risks and Solutions

18/08/2026
11:18

reading time : 2 min

Lucie Monnot

Content Marketing Manager

Every year, thousands of explosions occur in industries around the world, causing tragic loss of life and extensive property damage. In most cases, these disasters could have been prevented through a better understanding of ATEX zones and more rigorous management of explosive atmospheres.

But what exactly are ATEX zones? What risks do they involve? Which standards govern them and, above all, what practical solutions can help prevent the worst from happening?

This article provides a comprehensive guide to understanding, classifying and securing ATEX zones, and to taking effective action against the invisible but very real dangers found in potentially explosive environments. In an increasingly complex industrial world, safety is no longer optional. It is imperative.

What is an ATEX zone?

ATEX is an acronym derived from the French term “ATmosphères EXplosibles,” meaning “explosive atmospheres.” The term refers to areas where explosive mixtures can form between ambient air and flammable substances in the form of gases, vapors, mists or dust.

An essential point to understand is that these areas are not necessarily explosive at all times. They have the potential to explode under certain specific operating or environmental conditions.

The ATEX directives explained: ATEX 137 and ATEX 114

The European regulatory framework governing ATEX zones is based on two complementary directives:

The ATEX 137 Directive (1999/92/EC), also known as the “workplace directive,” applies to employers. It defines the requirements relating to:

Assessing explosion risks,
Classifying areas into ATEX zones,
Implementing appropriate preventive measures,
Preparing an Explosion Protection Document, known in France as the DRPCE.

The ATEX 114 Directive (2014/34/EU), formerly known as ATEX 95, applies to equipment manufacturers. It establishes the essential safety requirements for designing and manufacturing equipment intended for use in potentially explosive atmospheres.

Why ATEX zones matter for workplace safety

Properly identifying and managing ATEX zones involves much more than simply complying with regulations. It is a critical industrial safety issue.

By precisely identifying explosion risks, ATEX zoning makes it possible to:

Adapt equipment to the actual level of danger,
Define safe intervention procedures,
Provide appropriate training for the personnel concerned,
Prevent accidents with potentially catastrophic consequences.

The consequences of an industrial explosion can be devastating: loss of life, destruction of facilities, prolonged production stoppages and significant environmental impacts. Compliance with ATEX standards is therefore not optional, but an absolute necessity.

How ATEX zones are classified

The classification of ATEX zones is based on an assessment of the probability that an explosive atmosphere will form and persist. This assessment takes into account how frequently an explosive atmosphere is present and how long it remains.

The European system distinguishes between two main types of zones, depending on the nature of the flammable substances involved.

ATEX Zones 0, 1 and 2

These zones concern explosive atmospheres formed by flammable gases, vapors or mists mixed with air.

Source content requiring review: The following paragraph about Field Service Management appears unrelated to the ATEX zone classification section and may be an accidental insertion.

Field Service Management (FSM) software is a tool that centralizes service management in order to coordinate and optimize field service operations.

These systems are used to manage tasks involving the dispatch of technicians or workers to external sites, where they carry out activities such as installation, equipment maintenance and repair.

Zone	Description	Typical frequency or duration	Examples
Zone 0	An explosive atmosphere is present continuously or for long periods.	1,000 hours/year or more than 10% of the time	Inside storage tanks and chemical reactors
Zone 1	An explosive atmosphere is likely to form occasionally during normal operation.	10 to 1,000 hours/year or 0.1% to 10% of the time	Near filling openings and around pumps
Zone 2	An explosive atmosphere is unlikely to occur, and if it does, it will exist only for a short period.	Less than 10 hours/year or less than 0.1% of the time	Areas surrounding Zones 0 and 1, and near flanges and connections

ATEX Zones 20, 21 and 22

These zones concern explosive atmospheres formed by clouds of combustible dust suspended in the air.

Dust represents an often underestimated danger. A fine layer of dust just 1 mm thick can create an explosive atmosphere across a considerable volume once it becomes suspended in the air.

Zone 20: an explosive atmosphere in the form of a dust cloud is present continuously or frequently. This zone is typically found inside equipment such as silos, grinders and dryers.
Zone 21: an explosive atmosphere in the form of a dust cloud is likely to form occasionally during normal operation. This zone often corresponds to areas near loading, unloading or bag-filling points.
Zone 22: an explosive atmosphere in the form of a dust cloud is unlikely to occur, and if it does, it will exist only for a short period. This zone generally includes areas surrounding Zones 20 and 21, as well as spaces where layers of dust could exceptionally become suspended.

This systematic classification makes it possible to adapt protective measures precisely to the actual level of risk.

Equipment for ATEX zones

Selecting suitable equipment is a decisive factor in ensuring safety in ATEX zones. Every device used in these environments must be specifically designed to prevent it from becoming an ignition source.

Equipment groups and categories

ATEX equipment is classified into groups and categories that determine its suitability for different hazardous zones.

Equipment groups:

Group I: equipment intended for mines susceptible to firedamp,
Group II: equipment intended for all other locations with potentially explosive atmospheres.

Group II is also subdivided according to the nature of the explosive atmospheres:

IIA: Propane, less hazardous,
IIB: Ethylene, intermediate hazard,
IIC: Hydrogen and acetylene, more hazardous.

Equipment categories:

Category	Protection level	Applicable zones	Protection provided
1	Very high	Zones 0 and 20	Safety is ensured even in the event of two independent failures
2	High	Zones 1 and 2	Safety is ensured in the event of a foreseeable failure
3	Normal	Zones 2 and 22	Safety is ensured during normal operation

How can risks be reduced in ATEX zones?

Effective risk management in ATEX zones requires a comprehensive approach combining accurate assessment, appropriate technical measures and employee training.

Site audits and customized design

An ATEX audit is the essential first step. It makes it possible to identify risks precisely and develop customized solutions.

A comprehensive audit generally includes:

Identifying all flammable substances present on the site,
Assessing potential ignition sources,
Mapping hazardous areas in detail,
Analyzing the compliance of existing equipment,
Developing a prioritized action plan.

On the basis of this audit, it becomes possible to design facilities that integrate ATEX requirements from the outset. This is far more effective and cost-efficient than adapting existing facilities at a later stage.

ATEX training and certification

The human dimension remains essential when preventing ATEX risks. Appropriate training is not only a legal obligation, but also a key safety factor.

ATEX training should be adapted to each person’s responsibilities:

Level 0: general awareness training for all personnel working near ATEX zones,
Level 1: in-depth training for operators working directly in ATEX zones,
Level 2: specialized training for those responsible for defining zones and selecting equipment.

This training should be updated regularly and supplemented with practical exercises to maintain a high level of vigilance.

Solutions and equipment for ATEX zones

Safety in ATEX zones relies on a range of practical measures, from certified equipment to intelligent prevention systems. A comprehensive approach combining technical rigor with management tools is essential to control the risks associated with explosive atmospheres.

Suitable cleaning equipment

In ATEX environments, industrial cleaning presents a major challenge. Flammable dust and residues must never be dispersed into the air by unsuitable equipment. ATEX-certified vacuum cleaners, equipped with explosion-proof motors and grounding systems, enable safe operations. For wet cleaning, high-pressure cleaners specifically designed for these zones make it possible to work safely, even in the presence of flammable gases or vapors.

Explosion protection

No safety strategy can claim to eliminate risk completely. This is why it is essential to provide systems capable of containing or stopping an explosion in the event of an incident. Explosion vents, for example, release accumulated overpressure, while reinforced structures can withstand the shock wave without collapsing. On the active protection side, suppression systems detect the first milliseconds of a deflagration and automatically trigger extinguishing, while isolation valves separate pipelines to prevent the explosion from spreading.

Detection systems play a fundamental preventive role. Gas sensors, dust probes and thermal cameras make it possible to intervene before the danger becomes critical.

An intelligent solution: Nomadia Protect

To manage all these systems, Nomadia Protect acts as a true ATEX safety co-pilot. It centralizes essential information, maps hazardous areas, monitors inspections and regulatory compliance, and supports technicians directly in the field through a dedicated mobile application.

More than a simple tool, Nomadia Protect makes it possible to integrate ATEX requirements into a proactive industrial safety strategy, with complete traceability of the actions carried out.

The right equipment in the right place

Every device intended for use in an ATEX zone must meet strict certification criteria. The “Ex” marking, together with a series of precise indications, including the group, category, type of atmosphere and temperature, makes it possible to verify at a glance whether the equipment is suitable for its environment.

Ultimately, properly understanding and managing ATEX zones is a major issue for any industry exposed to the risks associated with explosive atmospheres. Far more than a regulatory obligation, it is an essential investment in people’s safety and the long-term sustainability of industrial facilities.

The systematic classification of zones, the rigorous selection of suitable equipment and the implementation of effective preventive measures form an inseparable combination for optimal explosion-risk management.

Let us not forget that behind every ATEX standard and procedure, the ultimate objective is fundamentally human: protecting lives and ensuring safe working conditions, even in the most hazardous environments.

For the companies concerned, committing to a rigorous and proactive ATEX approach is not only a matter of compliance, but also a matter of social responsibility and operational excellence.

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