What workplace preparedness means
Volcanic activity can affect a business through direct exposure, blocked access or loss of essential services. Workplace planning must cover people inside the premises, people travelling for work and employees performing outdoor tasks. Distance from the volcano alone does not describe every possible consequence or establish that a particular route is safe to use.
Preparedness means deciding in advance which tasks will stop, how an alert will reach staff and who will check protective conditions. It does not mean distributing equipment and continuing normal operations. An eruption can disrupt communications, electricity, water, transport and access to assistance at the same time.
This article addresses organisational prevention. The response must follow the competent authority and the workplace-specific assessment. Observation visits, repairs and retrieval of materials do not justify entering restricted areas on personal initiative. Maintaining an essential service requires specialist planning, rather than an informal exception to occupational safety requirements or a decision based solely on production priorities.
Ash, gases and other hazards differ
Ash consists of solid particles; gases represent a different exposure. The absence of a visible cloud does not establish that the atmosphere is safe. Smell is not a reliable test either. Assessment must identify the agents relevant to the location and event, including potentially hazardous atmospheres in depressions or enclosed areas.
Ash can irritate the eyes and respiratory tract. Assessing crystalline silica risk requires information about composition and respirable exposure: different ash deposits are not interchangeable, and exposure does not automatically establish a particular disease. People with asthma or other conditions may require specific measures determined by healthcare professionals.
For practical planning, give each hazard its own decision: dust exposure, gases, structural damage and restricted access cannot be resolved by a single measure. A prevention record can separate these checks and explicitly leave unknown information unresolved. A favourable particle reading must not conceal the fact that gas hazards or the stability of the building still need assessment before work can resume.
Official alerts and work decisions
A business should identify the official information channels for its territory and appoint a primary contact and deputy to receive alerts. In the Canary Islands, PEVOLCA provides the specific coordination framework for volcanic emergencies. The existence of that plan does not establish the current alert level; consult current official communications for that information.
As an organisational proposal, link each relevant alert to previously agreed decisions: suspending journeys, closing areas, contacting external personnel or activating a form of work compatible with safety. The decision list should identify the responsible person, the recipients and how receipt of the instruction will be confirmed across shifts.
Evacuation, sheltering and access restrictions take precedence over a planned business opening. In Spain, the Occupational Risk Prevention Act provides for information, interruption of activity and leaving the workplace in circumstances of serious and imminent risk, subject to the legal conditions. Staff protection must not be held back while waiting for a commercial decision about whether opening remains financially worthwhile.
Task-specific exposure assessment
Assessment should describe the actual task, location, duration, physical demands, agents and potentially exposed people. Cleaning an entrance, driving, servicing filters and working inside an office are different situations. Conditions also change when wind, traffic or an operation disturbs existing deposits. The assessment must follow those changes rather than assuming yesterday’s decision remains valid.
Public air-quality data provides context but does not automatically replace representative occupational exposure measurement. The prevention service should determine what information and measurements are necessary, how to interpret them and which limits or criteria apply. A value shown by a public environmental application should not become a work permit by default.
One useful approach is to document each task through four fields: available evidence, controls in place, suspension conditions and the person validating the decision. Where essential information is missing, acknowledge the uncertainty and avoid the task until it is resolved. Review the assessment when the activity, surroundings or findings change, rather than retaining an earlier authorisation through inertia.
Facilities, ventilation and collective protection
Protecting a building requires checking its critical functions and actual occupancy conditions. Competent technical staff should consider air intakes, filters, drainage, electricity supply and sensitive equipment. The objective is to prevent a measure against ash from creating a different hazard inside the workplace, particularly where production processes continue operating.
Closing air intakes or stopping all ventilation is not a valid prescription for every industrial facility. Some processes depend on extraction, air renewal or temperature control. Assess any change alongside internal emissions, occupancy and equipment instructions. If safe conditions cannot be maintained, suspend the affected activity rather than treating indoor work as automatically acceptable.
As an organisational example, maintenance staff can prepare a list of systems whose failure requires an area to close and a separate list of checks needed for reopening. Do not manipulate contaminated electrical installations or remove safeguards to accelerate recovery without the required procedure and competence. Having spare parts available does not constitute authorisation to perform the intervention.
Travel and external personnel coordination
A decision to maintain a shift must include whether people can arrive and return safely. Official restrictions, route conditions and communications availability may change during the working day. Checking that access was possible early in the morning is insufficient, as is transferring the entire decision to the individual driver without organisational support.
Coordination between businesses must reach cleaners, transport providers, maintenance companies, security staff and other contractors. They need the same relevant information about closures, hazards and access conditions. A supplier should not travel to the site because its commercial contact is unaware of a suspension agreed by the prevention team.
One proposal is a record of people expected at each location, with an alternative contact method and confirmation of arrival or cancellation. Limit it to necessary information and respect privacy. Its purpose is location and communication, not requiring journeys through a restricted area. Questions about leave, remote work and employment consequences require examination of the applicable rules and individual circumstances rather than a universal answer.
Planned cleaning and recovery
Ash removal should be treated as a new or modified activity, with assessment, responsibilities, resources and limits. Pressure to restore service does not make the regular workforce specialists in roofs, electricity or hazardous atmospheres. Before work begins, define the authorised areas and the conditions that require the activity to stop.
On roofs, deposits can add loading and conceal fragile surfaces. Staff should not be sent up to inspect or clean without structural assessment and a plan for work at height. Indiscriminately adding water is also inappropriate: its effects on loading, electricity and dispersion need assessment for the particular situation rather than reliance on a general cleaning tip.
For accessible surfaces, the method should control dust and physical effort, as well as collection, transport and disposal of the material. Check equipment suitability; an available machine is not necessarily an appropriate one. As a final check, exits, passageways and emergency access must remain clear, with a record of unfinished areas and the restrictions that still apply.
Personal protection and health follow-up
Personal protective equipment supplements technical and organisational measures. Select it for the identified hazard, fit it to the person and check compatibility between items. Training should cover use, limitations, care and replacement. A photograph of equipment or its availability in a store does not demonstrate adequate protection for a particular task.
A particle filter does not protect against gases or supply oxygen. A mask must not be used as justification to enter an unknown atmosphere. Respiratory protection requires competent assessment, including fit and conditions of use. Eye and skin protection and the physical demands imposed by the equipment also require consideration rather than treating the respirator as the whole solution.
Health follow-up belongs to competent healthcare staff, with confidentiality and legal safeguards. The organisation receives necessary preventive conclusions, not diagnoses for circulation among managers. If symptoms develop during work, stop the exposure and activate the planned assistance according to severity. The information should inform control reviews, without automatically attributing every episode of discomfort to volcanic activity.
Emergency response, communication and continuity
Emergency arrangements should cover warning, accounting for people, understandable instructions and coordination with external services. Anticipate the loss of a communication channel and the needs of anyone requiring assistance. Information passed on should identify the workplace and observed situation without inventing diagnoses or unsupported estimates of safety conditions.
The business plan must integrate applicable territorial instructions. In Spain, the Basic Civil Protection Planning Guideline for Self-protection published through Order INT/1068/2026 establishes the framework according to its scope, alongside regional and local requirements. Formal obligations are not identical for every business, although all must address their occupational prevention duties. Foreign emergency guidance cannot replace that assessment of applicable requirements.
As a preparatory exercise, simulate receiving an alert while a contractor is travelling and another team is working off site. Check who communicates suspension, who confirms receipt and how a critical function can be maintained without inappropriate exposure. The exercise is an improvement proposal; it does not itself demonstrate that the facility will be safe during an actual emergency.
Return to work and useful indicators
Return to work should depend on access authorisation where required and workplace-specific checks. The end of an emergency phase does not mean that deposits, damage or restrictions have disappeared. Verify the suitability of buildings, equipment, routes and services needed for each activity before resuming it, with responsibilities for the outstanding checks clearly assigned.
A proposed approach is reopening by area and task, recording an owner, date, evidence and remaining restrictions. For example, an office might be ready while a warehouse remains closed pending technical checks. That decision should not automatically extend to cleaning, maintenance or roof work, which require their own assessments and arrangements.
Useful indicators include confirmed receipt of alerts, tasks with current assessments, outstanding controls, trained personnel and actions closed with evidence. These are management proposals, not clinical indices or guarantees of zero risk. A properly configured digital record can support traceability but cannot replace professional judgement. After the event, review observations and amend the plan instead of closing issues simply because production has recovered.
Frequently asked questions
Does a particle respirator protect against volcanic gases?
No. Particle filters do not protect against gases or supply oxygen. Competent assessment must determine the necessary controls and protection; having a mask does not justify entering an unknown atmosphere.
Can public air-quality readings authorise cleaning?
Not on their own. They provide context, but exposure during a task may differ. Assess the agents, activity, necessary measurements and task-specific controls.
Can ordinary staff clean ash from a roof?
Do not assign that task without structural assessment, work-at-height planning, suitable resources and competence. Pressure to restore service does not replace those requirements.
Who decides when staff can return?
Respect the competent authority’s authorisations and restrictions and complete the workplace’s preventive and technical checks. Reopening may be partial and task-specific.
