Why can't automobile exhaust emission standards be met when testing exhaust gas?

1. Automobile exhaust mainly refers to the exhaust gas discharged from the exhaust pipe. Exhaust gas contains 15 ~ 2 different compounds, among which carbon monoxide and hydrocarbons are the most harmful to people. Excessive discharge of harmful gases will cause air pollution, which will lead to a series of symptoms such as chronic bronchitis, decreased lung function, and even lead to lung cancer and thyroid cancer. Seriously damage human health.

2. Vehicles whose exhaust emissions are not up to standard can be improved by installing exhaust gas purification devices.

3. A gasoline vehicle can be equipped with a three-way catalytic device and an electronically controlled air supply system, and a diesel vehicle should be equipped with an exhaust smoke purification device.