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Question 1 Briefly explain the following concepts related to exposure thresholds: time-weighted average, short-term exposure limit, exposure ceiling, and biological exposure indices. Your response must be at least 200 words in length. (References)

Question 2 Describe the most common types of airborne contaminants. List and describe the types of effects of airborne toxics on the body. Your response must be at least 200 words in length. (References)

Question 3 What is the difference between noise and sound? Describe the three main types of noise-control strategies, and give at least two examples of each type. Your response must be at least 200 words in length. (References)