What are some of the possible health consequences for employees exposed to mixtures of toxic air contaminants? How can the Safety Professional determine if levels of mixtures are safe? Provide examples in your response.

What are some of the possible health consequences for employees exposed to mixtures of toxic air contaminants? How can the Safety Professional determine if levels of mixtures are safe? Provide examples in your response. 

Your response should be at least 250 words in length. You are required to use at least your textbook as source material for your response. All sources used, including the textbook, must be referenced; paraphrased and quoted material must have accompanying citations.