An increase in automobile use has led to increased demand for fuel. The extraction, processing, and delivery of fuel put harmful pollutants into the atmosphere. The fuel that is then consumed by engines creates carbon dioxide emissions. The carbon dioxide creates a greenhouse effect in the atmosphere. The gasses trap heat in Earth's atmosphere, leading to global warming.

NO2 is the most harmful of these compounds and is produced during combustion in fuel engines and industry. It can damage the human heart and lungs, and high concentrations reduce the visibility of the atmosphere. Finally, it is an important precursor for the formation of ground-level ozone.

NO2 is the most harmful of these compounds and is produced during combustion in fuel engines and industry. It can damage the human heart and lungs, and high concentrations reduce the visibility of the atmosphere. Finally, it is an important precursor for the formation of ground-level ozone.

Air pollution can damage crops and trees in a variety of ways. Ground-level ozone can lead to reduced yields of crops and commercial forests, reduced growth and viability of tree saplings, and increased susceptibility of plants to diseases, pests, and other environmental stresses (such as bad weather).

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