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Emission of particulate matter is a complicated problem nowadays. In previous years it was thought that only compressed ignition engines emitted particulate matter. Continuous development of IC engines, higher customer expectations and the very strict exigencies of new emissions legislation regarding the emission of greenhouse gases, force the engine producers to advance the direct injection of gasoline in spark ignition engines. The main advantages of using direct injection in an SI engine, such as lower fuel consumption and higher thermal efficiency, implicate a new problem concerning gasoline engines: the emission of particulate matter. The mass emission of PM is not a big threat, due to relevant low level. Unfortunately, the emission of particulate number and size distribution of PM were told to be the most major threat to human health from the modern world. The observed issue was a significant direction of development of the contemporary DISI engine over the last decade. Due to those expectations, many concepts and solutions to reduce PN emissions have been devised by engine producers. New legislation, including new measurement methodologies, have been compiled by the governments around the world. This paper contains an overview of results of the emission of PN, which were obtained from experiments conducted at BOSMAL and from the literature. Current and future legal regulations regarding the PN emissions were collated to the test results.