EXHAUST GAS DILUTION DEVICE AND PM MEASUREMENT SYSTEM

The invention provides an exhaust gas dilution device and a PM measurement system. The exhaust gas dilution device comprises: a dilution passage for supplying dilution air to dilute exhaust gas from the engine; a first exhaust gas introduction passage that introduces first exhaust gas discharged from the first engine into the dilution passage; and a second diluted exhaust gas introduction passagethat introduces, into the dilution passage, second diluted exhaust gas in which second exhaust gas discharged from the second engine is diluted, the dilution passage having a gas mixing portion that mixes the first exhaust gas introduced from the first exhaust gas introduction passage with dilution air, the first exhaust gas introduction passage introducing the first exhaust gas to a side upstreamof the gas mixing portion in the dilution passage, the second diluted exhaust gas introduction passage introducing the second diluted exhaust gas to a side upstream of the gas mixing portion in the dilution passage and a side