What gases are emitted from vehicle exhaust?
3 Answers
Vehicle exhaust emission standards comply with China IV standards. The following are the harmful substances and hazards of vehicle exhaust: Harmful substances in vehicle exhaust: Vehicle exhaust contains hundreds of different compounds, including pollutants such as solid suspended particles, carbon monoxide, carbon dioxide, hydrocarbons, nitrogen oxides, lead, and sulfur oxides. Hazards of vehicle exhaust: While directly endangering human health, exhaust emissions also have profound impacts on the environment of human life. Sulfur dioxide in the exhaust has a strong irritating odor and, when reaching certain concentrations, can easily lead to the occurrence of "acid rain," causing soil and water acidification and affecting the growth of crops and forests.
I noticed many friends are curious about what comes out of a car's exhaust pipe. According to data from environmental departments, gasoline vehicles mainly emit carbon monoxide, hydrocarbons, and nitrogen oxides, while diesel vehicles also release particulate matter. Especially in winter, when you see white mist from the exhaust pipe, it's actually nitrogen monoxide turning into nitrogen dioxide in the air mixed with water vapor. During Beijing's smoggy days, vehicle emissions can account for up to 30% of the PM2.5 pollution. To improve the situation, it's recommended to use public transport more often, regularly replace your car's air filter, and turn off the engine if idling exceeds three minutes to save fuel and reduce emissions.
As a mother of two, the pungent smell from car exhaust pipes at the school gate is my biggest fear. A specialist at the hospital once told me that carbon monoxide in exhaust fumes can cause dizziness, prolonged exposure to hydrocarbons leads to coughing, and the black smoke particles emitted by diesel vehicles can penetrate children's alveoli. Last year, I attached an air quality monitor to my child's backpack and found that pollutant concentrations skyrocketed 20 times while waiting at red lights. Now, I arrive five minutes early, turn off the engine, and wait at the school gate. Neighbors have followed suit, and even traffic police have praised us parents for our environmental awareness.
