Class II material has a medium lethal concentration (LC 50) in air of at least 200 parts per million but no more than 3,000 parts per million by volume of gas or vapor, or more than 2 milligrams per liter

Class III material has a medium lethal concentration (LC 50) in air more than of 3,000 parts per million but no more than 5,000 parts per million by volume of gas or vapor, or more than 30 milligrams per

Defined as Class I, Class II, Class III Class I material has a medium lethal concentration (LC 50) in air of 200 parts per million or less by volume of gas or vapor, or two milligrams per liter or less

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