By Maria Athanasiou MD MFOM MBA 

Why Occupational & Environmental Medicine shields humans in the Era of Climate and Environmental Crisis


The "E" in OEM — Occupational & Environmental Medicine,  — has long been treated as the quiet partner to Occupational Medicine. For decades, the focus has leaned heavily toward clinical workplace management: needle-sticks, ergonomic assessments, work-related stress management and return-to-work protocols, performance management, policies. But as the planet faces unprecedented ecological disruption, this imbalance is no longer sustainable. International bodies like the WHO, ILO, and others have issued urgent calls to action regarding heat stress, air pollution, and emerging infectious diseases. Yet, a glaring gap remains between high-level rhetorical commitment and actual regulatory delivery. If OEM specialists do not step forward to bridge this chasm, non-specialists will — to the detriment of workers and public health.

The Illusion of Policy Without Expertise

A recent Lancet Regional Health Europe paper rightly categorized climate-related occupational health research as overlooked and underfunded. Where regulations do exist—such as the sporadic heat-stress mandates in California or Qatar—they are the exception, not the rule. Most jurisdictions rely on vague policy statements that lack enforceable instruments.

But herein lies the critical question: How can we expect to enforce action when we have failed to invest in the environmental training of our own specialists? Forming a policy when a heatwave or wildfire smoke arrives is an exercise in futility; by then, it is already too late. True prevention requires proactive risk mapping, physiological monitoring, and engineered workplace adaptations. If OEM leaders do not command this space, we leave the floor open to non-specialists who lack the nuanced understanding of exposure pathways, toxicology, and occupational vulnerability. We cannot expect general practitioners or corporate HR departments to design complex heat-stress prevention matrices or manage ambient toxic exposure. This intervention must be initiated, designed, and executed by OEM specialists.

The Compounding Frontier: Natural Disasters, Geopolitics, and Industrial Failure
The urgency for OEM leadership extends far beyond rising temperatures. We are living in an era where environmental degradation, natural disasters, and geopolitical instability collide to create complex hazardous environments for workers and communities alike.

Extreme Weather and Wildfires - The Transboundary Toxicological Threat: 

Climate change has supercharged the frequency and intensity of wildfires and extreme weather events. Wildfire smoke contains a toxic slurry of fine particulate matter, heavy metals, and volatile organic compounds (VOCs). OEM specialists are uniquely qualified to evaluate the respiratory and cardiovascular risks of outdoor workers (first responders, agricultural workers, utility crews) and dictate when a workplace must halt operations.  Wildfires are no longer isolated forestry crises; they are massive, mobile industrial-scale exposure events. Wildfire smoke is a complex, toxic slurry of fine particulate matter, heavy metals, volatile organic compounds (VOCs), and polycyclic aromatic hydrocarbons (PAHs). This smoke respects no geographic boundaries, transforming thousands of square miles of urban environments into toxic hazard zones overnight. The scariest part of this; there is no scientific evidence or study on how long it can take for air to return to toxic particle-free levels. For outdoor personnel—including first responders, agricultural labourers, utility crews, and delivery drivers—breathing this air is equivalent to working inside an unventilated manufacturing plant. OEM specialists are uniquely trained to understand the multi systemic (inflammatory, cardiovascular, immune, skin, ophthalmic and respiratory) impacts of these acute-on-chronic exposures. Non-specialists cannot accurately determine when a regional air quality index mandates a halt to operations, nor can they expertly navigate the complex interface of respirator fitting and secondary cardiovascular risk management in compromised workers.

Floods and Storm Surges: The Aftermath Complex

While the immediate phase of a severe flood or hurricane focuses on emergency rescue, the prolonged secondary phase is entirely an environmental medicine crisis. As floodwaters recede, they leave behind an highly hazardous environment. Displaced biohazards, industrial chemicals, ruptured sewage lines, bacteria dominance and structural collapses turn entire areas and workspaces into complex exposure vectors. Furthermore, within 24 to 48 hours, water-damaged indoor environments undergo massive fungal proliferation, exposing recovery workers and returning employees to unprecedented toxic hazards. OEM leaders must be the ones to govern post-disaster re-entry protocols. They possess the unique training to map these mixed exposures—ranging from electrical hazards and heavy metal contamination to biological pathogens—and to design the necessary medical surveillance programs for the workforce tasked with rebuilding infrastructure.

Heatwaves: The Exertional and Cognitive Breaking Point

Heatwaves represent an immediate threat to human physiology, yet mainstream policy routinely treats them as mere discomfort rather than an acute clinical emergency. At elevated temperatures, the human body relies on sweating and increased cutaneous blood flow to dissipate heat. When ambient temperature and relative humidity cross critical thresholds, the body's thermoregulatory mechanisms fail, triggering a cascade from heat exhaustion to fatal heat stroke. Critically, OEM research shows that excessive heat impairs cognitive performance and motor coordination long before clinical heat stroke sets in, resulting in a documented spike in occupational traumatic injuries (such as falls and machinery accidents). OEM specialists must spearhead the shift from passive, reactive hydration advice to proactive, engineered interventions—including mandatory physiological rest-cycle algorithms, automated wet-bulb globe temperature monitoring, and individualised acclimatisation protocols.

Vector-Borne Disease Proliferation

A major consequence of climate shift that general and other fields of medicine frequently fail to connect to the workplace is the geographic migration of disease vectors. Rising baseline temperatures and altered rainfall patterns have allowed ticks, mosquitoes, and sandflies to expand into territories where they were previously non-existent. Outdoor workers in forestry, construction, and agriculture are now on the frontlines of expanding zones for Lyme disease, Dengue fever, West Nile virus, and tick-borne encephalitis. An OEM specialist does not simply treat the resulting infection; they possess the epidemiological foresight to track regional vector migration, implement targeted workplace chemoprophylaxis and personal protective strategies, and differentiate an unconventional occupational exposure from a community-acquired illness.

The "Indoor" Heat and Air Quality Trap

When public health agencies issue extreme weather warnings, the standard advice is to "go indoors." However, for millions of industrial workers, the indoor environment offers no sanctuary. Warehouses, manufacturing plants, commercial kitchens, and older institutional buildings are frequently un-air-conditioned, poorly ventilated, and subject to intense radiant heat from heavy machinery or processing ovens. When a regional heatwave strikes, these indoor spaces transform into heat traps with stagnant air, compounding metabolic heat with ambient stress. OEM specialists understand that indoor thermal comfort is not just about a thermostat reading; it requires a deep understanding of fluid dynamics, industrial ventilation, industrial hygiene, and the physiological burden of wearing mandatory personal protective equipment (PPE) in uncooled spaces.

- Natural Disasters (Earthquakes, Tsunamis): When seismic events or tsunamis strike, the immediate focus is search and rescue. The secondary, prolonged crisis is an OEM crisis. Ruptured pipelines, collapsed chemical storage, and displaced hazardous materials (like asbestos and heavy metals) turn disaster zones into toxicological minefields for recovery workers and returning populations.

- Geopolitical Conflicts and Critical Infrastructure: Modern warfare and geopolitical tensions increasingly target or compromise critical industry infrastructure—chemical plants, manufacturing hubs, and water treatment facilities. When these plants are compromised, whether by cyberattack, kinetic warfare, or structural neglect due to supply chain failures, the resulting emissions and water pollution cross the boundary from "environmental accident" to systemic public health threat.

Recharging Undergraduate and Specialty Training

To safeguard the specialty from encroachment, we must fix the pipeline. We cannot claim ownership over environmental health if our undergraduate medical curricula and postgraduate residency programs treat it as an afterthought.

Medical students must be taught to see the patient through the lens of their environment. This means integrating environmental history-taking into standard clinical training and ensuring OEM residency programs heavily emphasise industrial toxicology, disaster medicine, and environmental epidemiology. We must train OEM specialists not just to treat the individual worker, but to audit, map, and fortify the entire enterprise against environmental shocks.

Moving forward - From Rhetorical Compliance to Legally Binding Enforcement

The bridge between a vague government policy statement and an enforceable workplace instrument must be engineered by OEM leaders. Currently, environmental and labor ministries globally are scrambling to address climate risks. For example, while the European Union’s Framework for Climate Resilience pushes for systemic adaptation metrics, and jurisdictions like California strictly enforce indoor and outdoor heat illness standards (Title 8, Sections 3395 and 3396), the vast majority of nations still rely on toothless advisory guidelines.

OEM taskforce groups must actively lobby regulatory bodies to mandate a critical legal concept: Risk Ownership. We must push for legislation that dictates that any workplace climate adaptation plan—whether managing ambient from wildfires, calculating localised Wet-Bulb Globe Temperature thresholds, or auditing indoor heat traps—is legally invalid unless designed and signed off by an accredited OEM specialist. By embedding OEM's unique expertise directly into national and international labor codes and occupational health inspections, we achieve a dual objective: we systematically insulate the workforce from environmental catastrophes while creating an ironclad regulatory barrier that non-specialists cannot legally cross.

safeguarding OEM as a specialty isn't just about demanding respect; it's about embedding the "E" of OEM directly into the legal framework of modern labor law.