Why does the United States regulate automobile manufacturing in so many ways?

Answer:
The US regulates automobile manufacturing to offset air pollution.
Explanation:
Automobiles are a major source of air pollution. The smoke emitted by automobiles consists of a number of harmful gases that adversely affect the environment in a number of ways.
If the manufacturing of automobiles is not regulated, increased production and use of automobiles will create greenhouse gases and contribute to global warming and climate change.