There are some applications, such as LPG (liquid petroleum gas) or diesel-fueled systems in remote locations, where you need to utilize combustion devices (stationary engines, boilers, etc) that do not meet this LEED credit for emissions. Available resources and one’s environment can greatly limit the range of options available and cleaner-burning fuel may not be available. For projects that need to use these devices, an additional particulate matter filter can be utilized to decrease the contaminates in the exhaust system. Is there a way to apply for this credit if a filter is incorporated into the exhaust system? Would this have to be a field test, or can one submit applicable documentation from the manufacturer(s) to prove compliance for this credit?