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NOTE: This is an unformatted excerpt from our online fire protection training library.

Nature of Smoke

Toxicity of Smoke

Studies of Toxic Gases

The following Primary Toxic Gases Table lists, in order of increasing estimated toxicity, those primary gases that have been suggested by various investigators as being potentially significant in fire situations. Human data are in most cases unavailable, and even primate data are rare. The tabulated values represent the estimated LC50 (in ppm).

LC50 = the concentration (in ppm) that would be lethal to 50 percent of the exposed subjects for the specified time.

It is important to note that the effect of a toxic gas exposure on a specific individual depends on both the physical and physiological characteristics of the individual.

Data on the combined effects are, as yet, rare, inconsistent, and insufficient for a general tabulation.

For ExampleFor example:
Based the Primary Toxic Gases Table provided, if 10 people were exposed to 9,000 ppm of Ammonia (NH3) gas, 5 out of the 10 people would be dead within 30minutes. Furthermore, If 10 people were exposed to 20,000 ppm of Ammonia (NH3) gas, 5 out of the 10 people would be dead within 5 minutes.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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