Environmental Stressors and the Workplace: How Climate Exposure Data Is Entering the Risk Assessment

For many organisations, climate has traditionally sat in the sustainability report, somewhere between carbon targets and environmental disclosures. What I am seeing now is something very different. Climate exposure is moving rapidly onto the operational risk agenda because the financial consequences are increasingly showing up in the workforce first.

The debate is no longer about whether heat, poor air quality and extreme weather affect people at work. The real question for boards, HR leaders and risk professionals is how quickly those exposures translate into absence, reduced productivity, operational disruption, higher claims costs and potential legal liability.

Climate Is Now a Workforce Risk

One of the biggest mistakes organisations make is treating environmental stressors as occasional events rather than ongoing operating conditions. That assumption may have been reasonable a decade ago. It is becoming increasingly difficult to defend today.

The World Health Organization (WHO) and World Meteorological Organization (WMO) guidance published in 2025 identifies workplace heat stress as a growing threat to both worker health and productivity, particularly among employees performing manual, outdoor and physically demanding work. The Health and Safety Executive (HSE) takes a similarly clear position, requiring employers to assess heat-related risks by considering factors such as workload, environmental conditions, clothing and personal protective equipment, while implementing appropriate controls where necessary.

What makes this issue more significant is the breadth of exposure. We tend to associate climate-related workplace risk with construction sites, transport networks or outdoor operations. In reality, offices, warehouses, care environments, logistics facilities and manufacturing sites can all experience the effects of excessive heat. Poor ventilation, demanding workloads and building design limitations can combine to create conditions that contribute to dehydration, fatigue, reduced concentration and declining performance.

That broader exposure footprint is precisely why climate data is beginning to appear in occupational risk assessments rather than being confined to environmental reporting frameworks.

Why Risk Models Are Changing

Traditional workplace risk management was designed for relatively stable conditions. Identify a hazard, assess its likelihood and impact, implement controls and review periodically. Climate exposure does not fit neatly into that model.

What I see increasingly is that the effectiveness of a control can change from one day to the next. Temperature, humidity, air movement, seasonal conditions, local heat alerts and infrastructure resilience all influence whether a workplace remains safe and productive. The question is no longer whether a control exists on paper; it is whether it remains effective under changing environmental conditions.

That shift is pushing organisations away from compliance-driven risk management and towards continuous operational monitoring.

The WHO and WMO report estimates that worker productivity declines by 2–3% for every degree above 20°C. That statistic matters because it reframes heat from a wellbeing concern into a measurable business variable. Productivity loss, after all, is rarely viewed as an environmental issue when it appears on a financial report.

The UK has no legal maximum workplace temperature. However, that does not reduce employer responsibility. If anything, it increases the importance of evidence-based assessments and proportionate controls. Climate exposure is therefore becoming part of the same conversation as sickness absence, workplace incidents, business continuity and operational resilience.

There is also a growing legal and reputational dimension. Government advisers are increasingly calling for stronger workplace protections against extreme heat. Boards should assume that stakeholders will expect more than broad wellbeing commitments. They will increasingly be asked whether the organisation has a credible adaptation strategy supported by evidence and action.

In practical terms, climate exposure is beginning to resemble other established workplace risks such as ergonomics or lone working. It is no longer a theoretical future concern. It is becoming a measurable and assessable business risk.

The Data Now Available

Another important shift is the quality of the data now available to organisations.

A few years ago, most employers had limited visibility into environmental exposure beyond local weather forecasts. Today, organisations can combine weather intelligence, postcode-level climate projections, building performance metrics, shift schedules and task intensity data to create a far more detailed picture of workforce exposure.

For organisations operating across multiple locations, this matters enormously. One site may continue operating normally while another faces repeated overheating events, localised air quality challenges or weather-related disruption. Treating climate exposure as a single enterprise-wide risk can therefore hide important operational realities.

The real value emerges when exposure data is connected to workforce outcomes.

According to the Office for National Statistics (ONS), the UK sickness absence rate stood at 2.0% in 2025, accounting for 148.8 million working days lost to sickness or injury and an average of 4.4 days lost per worker. Those figures are not specifically linked to climate exposure, but they provide an important baseline against which environmental factors can be assessed.

If an organisation cannot distinguish between routine seasonal illness and heat-related fatigue, dehydration or respiratory irritation, it becomes difficult to understand the true cost of workforce risk.

This is where climate exposure data becomes commercially valuable. It allows organisations to move beyond assumptions and identify genuine patterns. Leaders can determine which employee groups experience repeated exposure, whether controls are reducing incidents and near misses, and how environmental conditions influence absence and short-term productivity.

For insurers and risk professionals, that distinction is important. Risks that can be measured and monitored are far easier to manage than risks that exist only as anecdotal concerns.

Practical Business Impact

Many organisations initially view climate exposure as an HR issue. That interpretation is far too narrow.

Finance teams have a direct interest because environmental disruption affects productivity, overtime costs, temporary labour requirements, insurance claims and future capital investment decisions.

Facilities leaders are increasingly responsible because building performance, ventilation systems and cooling capacity have become important contributors to workforce resilience.

Risk teams are paying closer attention because climate conditions can influence both the frequency and severity of workplace hazards across locations, roles and seasons.

There is also a workforce equity dimension that deserves greater attention.

The WHO and WMO guidance highlights that older employees, workers with chronic health conditions and those with lower levels of physical fitness may be more vulnerable to heat-related illness. In practice, climate exposure is rarely distributed evenly. It often affects physically demanding, lower-paid and less flexible roles more severely than knowledge-based positions.

That creates implications not only for workforce health but also for employee relations, retention and long-term workforce planning.

The HSE’s recommendations around acclimatisation, rest breaks, access to cool water, engineering controls and training provide a useful framework for operational practice. However, I believe organisations make a mistake when they treat these measures as isolated health and safety interventions.

Climate exposure should be embedded into absence management, workforce planning, shift design, procurement decisions, facilities strategy and business continuity planning. This is not a health and safety problem. It is an enterprise-wide risk management challenge.

What Leaders Should Do

The organisations making the greatest progress are not simply responding to heat events. They are building structured climate adaptation capabilities. I would focus on five priorities.

First, climate exposure should be incorporated directly into the risk register. Heat, air quality, flooding and weather disruption need to be assessed alongside traditional workforce risks, ideally at site level rather than through a single enterprise-wide rating.

Second, organisations should connect climate exposure data to workforce outcomes. Absence trends, incident reporting, occupational health referrals, productivity metrics and employee turnover can reveal relationships that standard management dashboards often miss.

Third, building performance and work design should be reviewed together. Ventilation, cooling, hydration access, PPE suitability, task rotation and shift timing should operate as an integrated control framework rather than a collection of disconnected initiatives.

Fourth, leaders should establish clear triggers and thresholds. Local weather alerts, indoor temperature limits and role-specific risk criteria should determine when working practices need to change, activities should be paused or remote working arrangements activated.

Finally, climate adaptation requires visible executive ownership. Responsibility should sit with a named senior leader, supported by HR, Risk, Finance and Facilities functions, with regular reporting to the board or the relevant governance committee.

The Strategic Shift

The organisations that navigate this challenge most successfully will not necessarily be those with access to the largest volumes of climate data. They will be the organisations that turn that data into decisions.

The real value lies in identifying environmental stressors early enough to intervene before the consequences appear in sickness absence, insurance claims, operational disruption or declining performance.

Climate exposure is no longer a sustainability issue sitting at the edge of the business. It is becoming a measurable workforce risk with direct operational and financial consequences. The organisations that continue treating it as a future problem will find themselves reacting to costs after they appear. The organisations that act now will be the ones that understand, quantify and manage the risk before it becomes someone else's problem to explain in the boardroom.