ERPG concentration levels are determined by the chemical released.

ERPG concentration levels are determined by the chemical released.

• A. True
• B. False
• C. Only for certain chemicals
• D. Only under high pressure

Answer: (A)

The main idea here is that ERPG values are chemical-specific. For each chemical, a set of three ERPG concentrations is determined from toxicological data to represent increasing exposure thresholds: a level where most people would experience mild effects, a level where more severe effects could occur, and a level at which life-threatening effects could happen, all for short-term exposure. Because these thresholds come from how the particular chemical affects human health, they are assigned for the specific substance released, not for a general class of chemicals or for any given release scenario. They don’t depend on how much is released or on atmospheric pressure. That’s why the statement is correct: ERPG concentration levels are determined by the chemical released.

The main idea here is that ERPG values are chemical-specific. For each chemical, a set of three ERPG concentrations is determined from toxicological data to represent increasing exposure thresholds: a level where most people would experience mild effects, a level where more severe effects could occur, and a level at which life-threatening effects could happen, all for short-term exposure. Because these thresholds come from how the particular chemical affects human health, they are assigned for the specific substance released, not for a general class of chemicals or for any given release scenario. They don’t depend on how much is released or on atmospheric pressure. That’s why the statement is correct: ERPG concentration levels are determined by the chemical released.