What are the main pollutants in vehicle exhaust emissions?

[VonGiselle]

The main pollutants in vehicle exhaust emissions include carbon monoxide, hydrocarbons, nitrogen oxides, sulfur dioxide, lead compounds, benzo(a)pyrene, and particulate matter. The hazards caused by vehicle exhaust: 1. Cause respiratory infections, leading to decreased lung function, chronic bronchitis, tuberculosis, asthma, and neurasthenia; 2. Cause poisoning symptoms; 3. Lead to chronic lung diseases such as emphysema, and can also affect heart function and induce myocardial infarction; 4. Cause hypoxia in human tissues, leading to headaches, dizziness, slow reactions, and decreased neural function. Reasons for excessive vehicle exhaust emissions include: 1. Blocked or insufficient air intake in the intake system; 2. Carbon deposits in the cylinder, reducing the cylinder volume; 3. Low ignition efficiency of spark plugs, causing unburned gasoline to be expelled; 4. Clogged catalytic converter, obstructed exhaust flow, resulting in high back pressure in the cylinder and insufficient air intake.