What are the main pollutants not included in automobile exhaust?
2 Answers
Automobile exhaust does not include carbon dioxide as one of its main pollutants. The primary pollutants emitted from automobile exhaust are as follows: Carbon Monoxide: Automobile exhaust contains carbon monoxide, nitrogen oxides, and other solid particles that adversely affect human health, especially leaded gasoline, which poses greater harm to humans. Excess Oxygen: Lead in the exhaust is in the form of particles, dispersing with the wind. Gasoline mainly consists of carbon and hydrogen, and when it burns normally, it produces carbon dioxide, water vapor, excess oxygen, and other substances. Additive Impurities: However, due to other impurities and additives in the fuel, and the fuel often not burning completely, some harmful substances are emitted. Automobile Exhaust Composition: The composition of automobile exhaust is very complex, with over 100 components, and its main pollutants include carbon monoxide, hydrocarbons, and nitrogen oxides.
I've driven many cars before and found that the main pollutants in exhaust gases commonly include these: carbon monoxide, which comes from incomplete engine combustion; hydrocarbons, which are unburned fuel; nitrogen oxides, produced under high temperatures; and particulate matter, such as dust like PM2.5; carbon dioxide is also one of the main emissions, although it's not directly toxic. These substances pollute air quality, especially when driving in cities where you can sometimes smell unpleasant odors, and they can even trigger haze weather. As for major pollutants that are no longer included, lead is definitely not one anymore, because we now use unleaded gasoline. Twenty years ago, during the era of leaded gasoline, lead was a common pollutant, but it has long been phased out. If you notice a pungent smell, it's important to promptly check and repair the exhaust system of your car.
