Why did the Air Resources Board conduct the Roseville Rail Yard Air Quality Study?

The Placer County Air Pollution Control District requested the California Air Resources Board (ARB) study on behalf of Placer county residents to learn the levels of diesel emissions from the J.R. Davis Rail Yard and their relative impact. The District requested the study because of residents' concerns and because the ARB had identified "diesel particulate matter" as a toxic air contaminant.

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1. Why did the Air Resources Board conduct the Roseville Rail Yard Air Quality Study?
2. Why is the Air Resources Board (ARB) concerned about diesel particulate matter?
3. What are the results of the study?
4. What is being done to address the Rail Yard study results?
5. What can I do about the Rail Yard study results?