The rules and test protocols used by MSHA are very stringent and thorough. They are all publically available. The tests which are performed on filters to support the DPM regulations are described in Part 7 subpart E of Title 30 Code of Federal Regulations. http://www.msha.gov/30cfr/7.0.htm and http://www.msha.gov/30cfr/7.89.htm
The rules and regulations they have regarding diesel engines used in coal mines are the same as Australia in regards to 150°C surface temperatures, 77°C scrubber outlet gas temperatures and the emission testing follows the ISO 8178 Reciprocating internal combustion engines—Exhaust emission measurement off road test cycle referenced in AS3584 Diesel engine systems for underground coal mines and MDG27 Guideline for the management of diesel engine pollutants in an underground mine.
The testing done on engine diesel particulate signatures filters is arguably as or more comprehensive than that done within Australia and is available to be viewed and described in Part 7 subpart E of Title 30 Code of Federal Regulations. http://www.msha.gov/30cfr/7.0.htm and http://www.msha.gov/30cfr/7.86.htm Test equipment and specifications.