ultrafine particles

1. What are ultrafine particles, and what are the health concerns associated with them? Do you think that UFPs should be considered as a separate class of particulate matter and have established emissions standards, or do we need further study before regulating these particles?
 
Your response should be at least 200 words in length. You are required to use at least your textbook and the article listed above as source material for your response. You must also use one outside source. All sources used, including the textbook, must be referenced; paraphrased and quoted material must have accompanying citations.
2. How do epidemiologists distinguish between correlation and causation? Discuss the elements of Hill’s criteria, and provide an example of how correlation can be confused with causation.
Your response should be at least 200 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.
3. Discuss the findings of recent epidemiological studies on ozone. You may use the information in your text, or the EPA website (http://www.epa.gov/). After analyzing this information, do you think that the EPA should set lower limits on ozone emissions? Why, or why not?
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