Abstract: An exhaust gas measuring apparatus includes an atmosphere introducing unit, an air purifier, a diluting unit, selecting means, a sampling unit, and measuring means. The atmosphere introducing unit takes in air in the atmosphere as diluting air. The air purifier takes in and purifies air in the atmosphere, thereby generating diluting air. The diluting unit dilutes a portion of exhaust gases of an engine with the diluting air. The selecting means causes either one of the atmosphere introducing unit and the air purifier to communicate with the diluting unit. The sampling unit collects diluted exhaust gases. The measuring means obtains the emission amount of collected exhaust gases.

Abstract: An exhaust gas measuring apparatus includes an atmosphere introducing unit, an air purifier, a diluting unit, selecting means, a sampling unit, and measuring means. The atmosphere introducing unit takes in air in the atmosphere as diluting air. The air purifier takes in and purifies air in the atmosphere, thereby generating diluting air. The diluting unit dilutes a portion of exhaust gases of an engine with the diluting air. The selecting means causes either one of the atmosphere introducing unit and the air purifier to communicate with the diluting unit. The sampling unit collects diluted exhaust gases. The measuring means obtains the emission amount of collected exhaust gases.

Abstract: In a low-pressure testing apparatus for analyzing gas exhausted from cars under a condition in which air pressure is low, an exhaust-gas analyzing device is provided with a dilution tunnel for diluting exhaust gas from cars with air which is under a decompressed condition, the exhaust-gas analyzer is connected to said dilution tunnel at a supply port side thereof and arranged in a low-pressure testing room, and an exhaust intake is open to the air outside of the low-pressure testing room via airtight piping. An influence caused by the fluctuation of pressure within the low-pressure testing room upon the accuracy of anaylsis can be eliminated.