There are a number of commonly asked questions. Some answers are provided. We welcome your feedback and further questions.

1. What is the greenhouse effect?
2. How does NOx effect me?
3. How do particulate emissions effect me?
4. What is acid rain?
5. What is CRT?
6. What is SCRT?
7. What is Adblue?

This is an aqueous solution of urea, used in SCR systems to reduce Nitrogen Oxides (NOx). It is not mixed with fuel but is delivered from an injector into the exhaust stream.

(See Wikipedia: http://en.wikipedia.org/wiki/AdBlue)