When we think of warehouse fires, thermal radiation often dominates our concerns. How far can the fire spread? How much heat will it give off? But one equally critical—yet frequently overlooked—hazard is the toxic gas risk in warehouse fires, particularly from smoke and carbon monoxide.
Why Is Toxic Gas So Dangerous?
Toxic releases can travel much further than heat and are significantly harder to contain. While thermal radiation tends to have localized effects, toxic gases can infiltrate ventilation systems, move indoors, and affect occupants at much greater distances—even beyond the immediate fire zone. These gases can accumulate quietly, establishing hazardous concentrations over time without being visually detected.
Unlike heat, which can be mitigated with structural barriers and fireproofing, toxic gas exposure depends heavily on atmospheric conditions. A sudden shift in wind direction, for example, can instantly expand the threat zone, exposing people and facilities that were initially considered safe. In such scenarios, reliance on respiratory protective equipment becomes critical—but it’s not always sufficient.
How Can We Quantify the Risk?
To assess the impact of a toxic release, safety specialists use a measure called Dangerous Toxic Load (DTL). DTL calculates the toxic effects based on both concentration and duration of exposure. A widely recommended benchmark is the Specified Level of Toxicity (SLOT), which refers to exposure levels that may cause serious distress and require prolonged hospital treatment for up to 50% of those affected.
At OTECSA, we apply advanced fire and gas dispersion modelling to predict the spread of toxic substances from burning materials. This helps organisations plan effective emergency response strategies, define realistic muster points, and better protect employees, emergency responders, and nearby communities from invisible yet serious hazards.
Toxic gas risk in warehouse fires is a complex but manageable threat—provided it’s properly assessed. For more information, refer to Health and Safety Executive (HSE) guidance or reach out to our team to explore how OTECSA can support your fire and toxic release risk assessments.