What are the components of vehicle exhaust emissions?
2 Answers
Vehicle exhaust emission standards in China comply with the National IV Standard. Below are the harmful substances in vehicle exhaust and their hazards: Harmful substances in vehicle exhaust: Vehicle exhaust contains hundreds of different compounds, including pollutants such as particulate matter (PM), carbon monoxide (CO), carbon dioxide (CO2), hydrocarbons (HC), nitrogen oxides (NOx), lead (Pb), and sulfur oxides (SOx). Hazards of vehicle exhaust: While directly harming human health, exhaust emissions also have profound impacts on the environment. Sulfur dioxide (SO2) in exhaust has a strong irritating odor and can lead to "acid rain" when reaching certain concentrations, causing soil and water acidification and affecting crop and forest growth.
Vehicle exhaust emissions contain several components. Firstly, there's carbon dioxide, primarily produced from burning gasoline or diesel, which significantly contributes to global warming. Then there's carbon monoxide, a colorless and odorless gas that can cause poisoning if inhaled in large quantities, with emissions peaking during traffic jams. Nitrogen oxides are also quite common, especially from older vehicles, and they exacerbate smog and acid rain problems. Additionally, hydrocarbon emissions are substantial, resulting from unburned gasoline leaks, which easily form foul odors. Lastly, there are particulate matters, as fine as soot, that can penetrate human respiratory systems and cause diseases. Personally, I'm quite concerned about environmental protection and drive an energy-efficient car to reduce emissions. I recommend regular vehicle inspections to ensure the exhaust system has no leaks, thereby minimizing urban pollution.
