This standard serves as the core methodological framework for regulating the performance testing of dust particle counters (including emerging particulate matter concentration sensors) based on the principle of light scattering. It specifies in detail the test methods for multiple key performance parameters, such as sampling flow rate, false count rate, counting efficiency, and particle size channel accuracy. The standard encompasses a diverse range of test items, and accordingly, the required testing instruments are comprehensive. These typically include an aerosol generation and dilution system for producing standard particles of known sizes, a wind tunnel or sampling chamber to provide a stable testing environment, and standard reference instruments (such as condensation nucleus particle counters) for comparison. Additionally, specialized equipment like multi-channel pulse height analyzers (PHAs) is needed to analyze the response voltage of particles.