But some of the most serious risks are the ones that cannot be seen.
Awareness of contamination from combustion products is not new. As early as the 1770s, researchers observed links between occupational exposure to soot and disease. In 2022, the World Health Organization formally recognised firefighting as a carcinogenic occupation. This confirmed what many firefighters and researchers had long suspected – that repeated exposure to toxic fire gases and particles poses a long-term health risk.
At the same time, the nature of modern fires has changed, releasing a complex mix of toxic substances. Synthetic materials, treated furniture, electronics, insulation, and modern building products all contribute to smoke containing harmful chemicals. Firefighters may be exposed not only through breathing, but also through skin contact and contaminated equipment.
This exposure does not end when the fire is out.
Particles can remain on protective clothing, equipment, and vehicles, and may also spread to fire stations or even into firefighters’ homes if proper decontamination routines are not followed. Over time, these exposures accumulate.
In other words, the danger is not always the fire itself – but what the fire leaves behind.
Awareness is growing, but implementing solutions is not always easy.
In recent years, the fire service has become increasingly aware of contamination risks. Many departments are improving decontamination routines, reviewing equipment, and reconsidering operational tactics to reduce exposure wherever possible.
However, many operational routines within fire services were developed decades ago, under very different fire conditions. Cancer risks from contamination often develop slowly and remain invisible for years, which makes them easy to underestimate during everyday operations. Changing this requires a shift in mindset, both for firefighters on the ground and for officers responsible for tactical decisions.
Every incident today demands deliberate choices rather than relying on habit.
Research and operational experience increasingly show that initial exterior firefighting measures can significantly improve conditions for breathing apparatus (BA) crews entering a structure. Lower temperatures, clearer visibility, and reduced concentrations of harmful contaminants create safer working conditions inside the compartment.
By cooling and controlling the fire compartment from the outside, Cobra allows firefighters to influence the fire environment without introducing additional oxygen. This helps reduce temperatures, limit fire gas development, and create better conditions before crews enter.
When combined with positive pressure ventilation, the environment inside the compartment becomes cooler and cleaner for firefighters operating inside. Even where offensive PPV tactics are not used, exterior use of Cobra followed by natural ventilation can still reduce risk.
By lowering temperatures, limiting fire gas development, and improving the environment before entry, firefighters can reduce contact with harmful combustion products.
Because reducing exposure does not start after the fire. It starts with how the fire is fought.
Addressing contamination is no longer only about cleaning equipment after the fire. It is about changing the conditions of the fire itself.
Because the safest firefighter is not only protected from flames. They are also protected from what cannot be seen.
