* Carbon dioxide (CO2) is a greenhouse gas that traps heat in the atmosphere, contributing to climate change. Cars are a major source of CO2 emissions, accounting for about 20% of all CO2 emissions in the United States.
* Nitrogen oxides (NOx) can cause smog and respiratory problems. They can also lead to the formation of ozone, which is a harmful air pollutant.
* Hydrocarbons are unburned fuel molecules that can contribute to smog and ozone formation.
In addition to these primary pollutants, cars also release other gases, such as carbon monoxide, sulfur dioxide, and lead. These gases can also cause health problems and contribute to environmental damage.
The emission of gases from cars can be reduced by a number of methods, including:
* Improving engine efficiency: More efficient engines burn less fuel, which reduces the amount of emissions produced.
* Using cleaner fuels: Fuels such as natural gas and hydrogen produce fewer emissions than gasoline or diesel fuel.
* Installing catalytic converters: Catalytic converters convert harmful pollutants in exhaust gases into less harmful substances.
* Driving less: Reducing the amount of time you spend driving can help to reduce your emissions.
By taking these steps, we can help to reduce the environmental impact of cars and improve air quality.
