Hazmat Awareness for EMS
Hazardous materials (hazmat) incidents can occur anywhere: highway tanker rollovers, industrial facility leaks, residential drug labs, agricultural chemical spills, and even intentional releases. As an EMS provider, you are often among the first on scene and may encounter a hazmat situation before it is identified as one. Recognizing the signs of a hazmat incident and taking immediate protective action is essential for your safety and the safety of your patients and crew.
The key principle of hazmat response is that untrained rescuers must not enter contaminated areas. EMS providers at the awareness level are trained to recognize hazmat incidents, establish initial safety zones, and call for specialized resources. Only technician-level trained responders wearing appropriate chemical protective equipment should enter the hot zone. Becoming a contaminated victim yourself helps no one and creates additional casualties for an already strained response.
Recognizing Hazmat Incidents
Clues that suggest a hazmat incident include:
- Placards and labels: DOT placards on vehicles and containers identify hazardous materials by class (explosive, flammable, oxidizer, poison, radioactive, corrosive). The four-digit UN number on the placard can be looked up in the Emergency Response Guidebook (ERG) for specific substance information.
- Multiple patients with similar symptoms: If several people in the same area develop nausea, difficulty breathing, or skin irritation simultaneously, suspect a chemical exposure.
- Environmental clues: Dead animals or vegetation, unusual odors, visible vapor clouds, leaking containers, and abandoned laboratory equipment (potential drug lab).
- Patient presentation: SLUDGE symptoms (salivation, lacrimation, urination, defecation, GI distress, emesis) suggest organophosphate or nerve agent exposure.
Safety Zones and Initial Actions
Establish three safety zones around a hazmat incident: the hot zone (contaminated area, entry only by hazmat team), the warm zone (decontamination corridor between hot and cold zones), and the cold zone (safe area for command, staging, and patient treatment). As an EMS provider, you operate in the cold zone. Position your ambulance upwind and uphill from the incident. Do not eat, drink, or smoke anywhere near the scene.
Emergency Decontamination
In situations where contaminated patients self-present to EMS before the hazmat team arrives, emergency decontamination may be necessary to prevent secondary contamination of providers and ambulances. Basic emergency decontamination involves removing the patient's clothing (this alone removes approximately 80% of contamination), flushing the patient with large volumes of water, and isolating contaminated clothing in sealed bags. Wear the highest level of PPE available (at minimum, gloves, eye protection, and a mask) during emergency decontamination. Do not delay life-saving treatment for decontamination, but balance patient care with provider safety. Notify the receiving hospital before arrival so they can prepare their decontamination facilities.