Why is the Air Resources Board (ARB) concerned about diesel particulate matter?

Diesel engines emit a complex mixture of air pollutants, composed of gaseous and solid material. The visible emissions in diesel exhaust are known as particulate matter (PM), which includes carbon particles or "soot." In 1998, ARB identified diesel PM as a toxic air contaminant. Health risks from diesel PM are highest in areas of concentrated emissions, such as near ports, rail yards or freeways.

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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?