DDDD - What does DDDD stand for? The Free Dictionary
References in periodicals archive
(Code of Federal Regulations 2004) contains some emission factors intended to be used with the low-risk option; however, they tend to be more broadly applied by state regulatory agencies.
Appendix C to Subpart DDDD
of Part 63-Considerations for a Small-Scale Kiln Emission Testing Program.
The Federal Register, Appendix C to Subpart DDDD
of Part 63--Considerations for a Small-Scale Kiln Emission Testing Program (2006) lists several considerations for determining emissions from small-scale kilns to approximate emissions from full-scale kilns.