What are the harmful gases emitted by cars?

2 Answers
JuneRose
07/23/25 11:21pm
Automobile exhaust pollution is environmental pollution caused by the exhaust gases emitted by vehicles. The main harmful gases emitted include hydrocarbons, nitrogen oxides, carbon monoxide, and sulfur dioxide. Carbon Monoxide: Carbon monoxide is an intermediate product of hydrocarbon fuel combustion. Inhaling excessive amounts of carbon monoxide can cause shortness of breath, purple lips, difficulty breathing, and even death. Nitrogen Oxides: Nitrogen oxides are mostly generated in the combustion chamber of an internal combustion engine. The emission of nitrogen oxides depends on factors such as combustion temperature, time, and air-fuel ratio. Nitrogen dioxide is a reddish-brown respiratory irritant gas that has a significant impact on human health. Hydrocarbons: Methane is an asphyxiant gas with an odor threshold of 142.8 mg, and it only poses a health hazard at high concentrations. Ethylene, propylene, and acetylene primarily harm plants, preventing roadside trees from growing normally. Sulfur Dioxide: When the concentration of sulfur dioxide in automobile exhaust is too high in the atmosphere, it can form acid rain with precipitation. Acid rain damages forests and severely affects the living environment of wildlife.
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SanSpencer
08/10/25 7:16pm
When I'm driving, I often think about how car exhaust contains quite a few harmful substances. Carbon monoxide is the most dangerous - colorless and odorless, yet it reduces oxygen in the blood, causing dizziness if trapped in the car for too long. Nitrogen oxides are like the root of urban smog, creating ozone and acid rain, and can easily trigger asthma when inhaled. Hydrocarbons increase surface pollution, causing unpleasant odors and contributing to air pollution. Particulate matter is so small it can penetrate deep into the lungs, potentially causing long-term inflammation. Although carbon dioxide isn't directly harmful to humans, it heats up the planet leading to extreme weather. I've found that driving electric or hybrid vehicles can reduce these emissions, and I advocate for carpooling in daily life to cut down on exhaust. Remember that exhaust accumulates in tunnels or during rush hour, so keep windows closed to protect yourself.
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