What was the significance of the clean air act of 1970?
it established federal emissions standards.
it identified sources of air pollution.
it set a timetable for cleaner air.
it offered businesses incentives to stop polluting.
it allowed the burning of low sulfur oil.

The Clean Air Act of 1970 introduced several governmental bodies that would oversee air pollution. The groups tasked with looking after the air pollution were trying to limit pollution caused by various sources. They gave companies incentives to limit their pollution, so the answer is C.