This paper analyses the experimental investigation of a newly designed and developed diesel engine exhaust particulate matter (PM) agglomeration device. The purpose of the device is to agglomerate PM using use high-intensity sound waves. The primary goal of designed was to reach levels of sound pressure that were high enough to facilitate particle agglomeration. Experimentation and analysis revealed that the device achieves the necessary degree of sound pressure for particle aggregation within its confines. Also demonstrated the effective reduction of diesel exhaust PM (in the range of 0.2 to 10 µm) using an acoustic agglomeration device, which resulted in a decrease that was 2.5 times greater than before. The purpose of this work is to show is to demonstrate that a newly developed acoustic agglomeration device is suitable for the efficient removal of diesel engine exhaust microparticles.