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What does a zero value in exhaust emission testing mean?

1 Answers

DelHope

07/29/25 4:37pm

A zero value in exhaust emission testing indicates that there is a crack or leak in the middle of the vehicle's exhaust pipe, or that the sampling tube of the testing station's equipment has a leak or the equipment itself is malfunctioning. Standard values for vehicle exhaust emission testing: For gasoline vehicles, the HC (Hydrocarbon) emission standards for Euro I, Euro II, Euro III, and Euro IV are 1.1, 1.1, 0.66, and 0.46, respectively. The CO (Carbon Monoxide) emission standards are 4.5, 4, 2.1, and 1.5, respectively. The NOx (Nitrogen Oxides) emission standards are 8, 7, 5, and 3.5, respectively. The PM (Particulate Matter) emission standards are 0.36, 0.15, 0.1, and 0.02, respectively. Vehicle exhaust emission testing process: Computer entry of information, the dispatcher will have the staff drive the vehicle to the designated testing line, the control room confirms whether the vehicle to be tested has entered the correct testing line, exhaust emission testing, and then payment at the environmental testing fee counter.

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