What are the harmful gases emitted by cars?

[JuneRose]

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.

[SanSpencer]

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.

[CarlosDella]

We elderly folks have been driving for decades, and the smell of exhaust fumes is really unbearable. The main harmful gases include carbon monoxide, which can trigger angina if inhaled too much; nitrogen oxides that make me cough incessantly; particulate matter floating into the trachea aggravating asthma; and hydrocarbons mixed with foul odors irritating the eyes. These accumulate in traffic jams, so whenever I encounter them, I close the windows and turn off the air conditioning. Older cars tend to emit more pollutants, so I maintain the engine regularly and change the oil to keep combustion clean. Why should young people care? Because it harms health, especially for children playing by the roadside who are more susceptible to illnesses from inhaling these pollutants. Walking or cycling more not only saves money but also reduces pollution on Earth. Over time, I’ve come to deeply appreciate: clean air is a true blessing.

[LaMaci]

Technically speaking, harmful vehicle emissions originate from combustion. Incomplete engine combustion produces carbon monoxide; nitrogen oxides form under high temperature and pressure; unburned fuel turns into hydrocarbons; diesel engines also emit particulate matter. Modern vehicles use catalytic converters to transform these into harmless substances, but aging cars have higher pollution levels. I've researched optimizing air-fuel ratios to reduce emissions, with proper maintenance of spark plugs and filters being crucial. Vehicles with lower fuel consumption emit less, and supporting electrification is the future trend. Simply put, these gases are highly hazardous, but technological advancements can mitigate the issue.

[Haymitch]

I live in the city, where car exhaust fumes choke us every day. Harmful gases like carbon monoxide poison blood circulation; nitrogen oxides mixed with hydrocarbons create photochemical smog; particulate matter darkens the sky and increases the risk of lung diseases. These emissions peak during rush hour traffic jams, so I wear a mask to avoid inhaling them. The exhaust also corrodes building exteriors, and when the air pollution index soars, I try to stay indoors. Why emphasize this? It's linked to urban ailments, and reducing car usage in favor of public transport is effective for cutting emissions. Governance requires policy push, and I look forward to more green public transport initiatives.

[HavenFitz]

After having children, I became more vigilant about car emissions: Carbon monoxide can silently cause poisoning; Nitrogen oxides trigger asthma in children; Particulate matter penetrates deep into the alveoli causing long-term damage; Hydrocarbons irritate the skin. I've tried using the recirculation mode of the air conditioning in traffic to isolate pollutants, and driving low-emission vehicles to reduce my child's exposure risk. Emissions accumulate near schools, making walking to drop off and pick up safer. Reducing idling and starting the engine less can help protect the health of the next generation. Climate change is also linked to emissions, so choosing new energy vehicles can improve the environment.