Toxicity measurements permissible exposure limits

Measuring acid concentration is important for many applications, specifically for space and homeland security applications. Hydrochloric acid is released from the exhaust plume of solid rocket motors that use ammonium perchlorate as the rocket propellant. This plume can be dangerous in high concentrations and monitoring its concentration and dispersion are important tasks. Hydrochloric acid and other acid gases like nitric acid and hydrofluoric acid are also important and very dangerous toxic industrial chemicals and need to be monitored because of their low permissible exposure limits. 

So we can indeed identify and measure the various toxic contaminants that we find in the industrial environment, and we can compare these findings with the established limits of permissible exposure that will be discussed later. But sometimes there are situations where none of these procedures seem to have been applied. Let s look at another true story, this time about someone who didn t know anything about toxic hazards, much less about concentrations of toxic chemicals, and certainly didn t recognize the potential hazard of his environment. 

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