How to Determine Which National Emission Standard a Vehicle Belongs To?
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Here are the methods to determine which national emission standard a vehicle belongs to: 1. Check the back of the vehicle's environmental protection compliance label. 2. Estimate the vehicle's emission standard based on its manufacturing year. 3. Bring the vehicle registration certificate to the local DMV for inquiry. 4. Check the emission standard description on the vehicle's compliance certificate. The national emission standard refers to the regulations on the content of harmful gases such as carbon monoxide, hydrocarbons, nitrogen oxides, particulate matter, and soot emitted from vehicle exhaust. Its purpose is to prevent pollution of the environment by exhaust from compression-ignition and gas-fueled spark-ignition engine vehicles, protect the ecological environment, and safeguard human health.