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* Diesel engine exhaust gas is Real-time import export alertslarge (diesel engine exhaust gas pollution is serious and urgently needs to be treated) With the acceleration of industrialization, transportation has become an indispensable part of people's lives. However, the exhaust emissions brought by these vehicles have also become one of the important sources of urban environmental pollution. The exhaust gas pollution of diesel engines is increasing day by day, and it is urgent to control it effectively. I. Reasons for the exhaust gas of diesel engines. Diesel engines have higher combustion efficiency than gasoline engines, so they are more favored by the market. However, when the diesel engine is working, a large amount of exhaust gas containing harmful substances will be produced, mainly for the following reasons: 1. The sulfur content in diesel combustion substances is high, and a large amount of sulfur dioxide and other harmful substances will be produced after combustion.2. The combustion temperature is high, and the amount of nitrogen oxides and hydrocarbons is produced. 3. The part adopted by the diesel engine is the blue technology of the NOx reducer, because the NOx reducer needs to use urea solution as a reducing agent, and the output urea has a negative impact on the environment. II. Diesel engine exhaust gas harms some harmful substances in diesel engine exhaust gas, such as PM2.5, SO2, CO and NOx, which directly harm human health and the environment. PM2.5 can directly enter the human respiratory tract, causing harm to the lungs and leading to the occurrence of respiratory diseases; SO2 can damage the human mucosa, skin and eyes, causing cough, sore throat, headache and other uncomfortable symptoms; CO will combine with human hemoglobin, resulting in a decrease in the oxygen transport capacity of hemoglobin, to Cause serious harm to human health;NOx can form ozone and acid rain, causing direct harm to the environment. III. Diesel engine exhaust gas management In order to reduce the harm of diesel engine exhaust to the environment and human health, a series of management methods can be adopted, such as: 1. Reduce the number of diesel vehicles, restrict motor vehicles to specific areas, and advocate low-emission vehicles such as public transportation. 2. Use high-grade gasoline and diesel to reduce the emission of sulfur-containing substances and other harmful substances. 3. Transform and upgrade the diesel engine, using improved combustion technology and exhaust gas purification equipment, such as DPF (particle filter) and SCR (selective catalytic reduction). 4. Carry out traffic management and monitoring means, such as environmental protection inspection and vehicle exhaust gas detection, and strengthen the supervision of exhaust emissions. 5. Strengthen public education and promote environmental protection awareness and a scientific and low-carbon lifestyle.IV. Conclusion: The exhaust gas of diesel engines is seriously polluted, which brings great harm to the environment and human health. For this reason, it is necessary for the government, enterprises and all sectors of society to work together to manage and take a variety of means to effectively reduce the exhaust emissions of diesel engines. We should also start from ourselves in our daily life, minimize the use of motor vehicles, choose environmentally friendly and low-carbon travel methods, and jointly build a green and clean ecological environment.

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