4 Hazardous Materials Awareness for EMS

Recognize the limits of the awareness role

A hazardous-materials incident can expose responders and patients to toxic, corrosive, flammable, reactive, or oxygen-displacing substances. EMS personnel should recognize possible hazards, stay out of danger, communicate useful information, and provide care only in an area and role for which they are trained and equipped.

Awareness-level responders identify a suspected release and notify the appropriate authorities. They do not enter the hazard area to investigate, rescue, or stop a release.

Recognize warning signs from a safe location

Treat a scene as potentially hazardous when circumstances suggest a release, even if the substance is unknown. Warning signs include:

• Placards, labels, shipping papers, container markings, or pipeline signs.

• A leaking, damaged, overturned, or unusually warm container; hissing, vapor, smoke, dust, or liquid pooling.

• Unexplained odors, dead vegetation or animals, or multiple people suddenly experiencing similar symptoms.

• A fire, crash, industrial incident, or confined-space emergency involving chemicals, fuels, gases, or unknown materials.

Do not approach to read a label, identify a smell, touch a substance, or check on a patient in the suspected hazard area. Odor is not a reliable warning: some dangerous substances have little or no odor, and smell can disappear as a person’s sense of smell becomes impaired. Observe from a safe location and report what can be seen without getting closer.

Isolate the scene and use initial guidance

Stop at a safe distance, keep others from entering, and advise dispatch that hazardous-materials involvement is suspected. If it is safe and within your role, position the ambulance outside the suspected hazard area and away from smoke, vapors, runoff, and traffic hazards. Do not move through a plume or across a spill; wind, terrain, and building ventilation can change where a substance travels.

Use the current Emergency Response Guidebook (ERG) for initial guidance on transportation incidents. The 2024 ERG is intended for the early phase of hazardous-materials transportation incidents. Once the material is identified, consult its guide and, where applicable, the ERG’s initial isolation and protective action distances. Those distances depend on the material and incident conditions; do not substitute a guessed distance. If the material or conditions are uncertain, keep back and request direction from incident command or the hazmat team.

Follow scene control and protective actions

Incident command establishes scene control and coordinates protective actions. Common operational areas are the hot zone, where there is a contamination hazard; the warm zone, a controlled transition and decontamination area; and the cold zone, a support area intended to be free of contamination. Qualified personnel set and adjust boundaries as conditions change. EMS should stage and provide care only where assigned; ordinary ambulance PPE does not make entry into a contaminated area safe.

Evacuation or shelter-in-place decisions depend on the substance, release, wind, buildings, population, and other conditions. Follow incident command and public-safety instructions. When evacuation is directed, routes should avoid the release and plume; movement crosswind and then upwind may be appropriate when directed and safe. Do not send people through a hazardous area to escape.

Communicate and coordinate

Give dispatch and incident command a concise, plain-language report that includes:

• The exact location and incident type, with nearby roads, buildings, or landmarks.

• Visible container markings or placards, if readable from a safe location; do not guess the substance.

• Signs of a release, fire, vapor or smoke movement, and apparent wind direction if known.

• The approximate number and location of patients, observed symptoms, and whether people may be contaminated.

• Your unit’s location, actions taken, and needed resources, including a hazmat team and decontamination capability.

Maintain radio contact, follow the incident command system, and report changing conditions. Emergency-response activities at a hazardous-substance release must be coordinated through the incident commander.

Provide care without creating additional exposure

Do not enter a suspected contaminated area or load a potentially contaminated patient into an ambulance unless the response plan, incident command, training, and suitable protective measures authorize it. Coordinate rescue, extraction, decontamination, and medical treatment with the hazmat team. Patients who have not been decontaminated may contaminate responders, equipment, and vehicles. Notify receiving facilities of possible contamination before transport when required by local procedure.

EMS personnel assigned to enter a danger area for rescue or treatment need training, equipment, and authorization appropriate to that task; awareness-level training alone is not sufficient for entry. Some EMS duties outside the danger area may also have specific training requirements under applicable OSHA rules and the employer’s response plan. Follow agency policy and local regulations.

Apply the response priorities

Recognize warning signs without approaching, isolate yourself and others from the suspected hazard, and notify dispatch and incident command. Use the ERG and qualified hazmat personnel for initial protective guidance, and follow command decisions on staging, evacuation, sheltering, decontamination, and patient care. The urgency of a medical call does not make entry by an untrained or unprotected responder safe.