Why does the united states regulate automobile manufacturing in so many ways?

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.  

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one of the negative side effects were the economic losses the events of september 11th caused. many, many people lost their jobs as a result of a downturn in the economy after the terrorist attacks.