What are the harmful gases emitted by vehicles?

[GideonRose]

Vehicles emit harmful gases such as carbon monoxide, hydrocarbons, nitrogen oxides, lead, sulfur dioxide, and soot, which pollute the environment and are harmful to human health. Due to the severity of environmental pollution, countries worldwide have implemented strict vehicle emission standards to limit exhaust emissions. China's current standard, China 6, reduces carbon monoxide emissions from gasoline vehicles by 50% (excluding driving conditions and testing influences), lowers total hydrocarbon and non-methane hydrocarbon emission limits by 50%, and tightens nitrogen oxide emission limits by 42%. Vehicle emission standards aim to prevent pollution from compression-ignition and gas-fueled spark-ignition engines, protect the ecological environment, and safeguard human health.