Why is it important to establish QA/QC procedures before any sampling is done?

Imagine that you are tasked with developing a sampling plan for an air pollution study. In your own words, describe each of the quality assurance/quality control concepts you should consider as you develop your analytical protocol. Why is it important to establish QA/QC procedures before any sampling is done?

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.

Question 6
How does an aerodynamic diameter of a particle relate to the measurement of the physical diameter of a perfect sphere? If you were conducting a study on the movement of fly ash particles from a smokestack, would you use a straightforward diameter measurement or the aerodynamic diameter? Why?

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