Health Hazard – Blue | NFPA Hazard Diamond | Identification
Diagram
This hazard diamond is from the National Fire Protection
Association-NFPA Code. The first number relates to Health (Blue) Hazards, the
second number relates to Flammability (Red), and the third to Reactivity (Yellow).
The Health Hazard having the number from 0 to 4.
Health Hazard (BLUE)
Hazard Rating 4 - A few smells of the gas or vapor could
cause death or the gas, vapor, or liquid could be fatal on powerful the fire
fighter's normal full protective clothing that is designed for resistance to
heat. For most chemicals having a Health hazard rating of 4, the normal full
protective clothing available to the average fire department will not provide
adequate protection against skin contact with these materials. Only special
protective clothing designed to protect against the specific hazard should be
worn.
Hazard Rating 3 - Materials extremely hazardous to health,
but areas may be entered with extreme care. Full protective clothing, including
self-contained breathing apparatus(SCBA), rubber gloves, gumboots and bands
around legs, arms and waist should be provided. No skin surface should be
exposed.
Hazard Rating 2 - Materials hazardous to health, but areas
may be entered freely with self-contained breathing apparatus(SCBA).
Hazard Rating 1 - Materials only slightly hazardous to
health. It may be desirable to wear self-contained breathing apparatus(SCBA).
Hazard Rating 0 - Materials, which on exposure under fire
conditions, would offer no health hazard beyond that of ordinary combustible
material.
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