which was a requirement of the clean air act?\ncar manufacturers had to make smaller cars.\ncleaner…

which was a requirement of the clean air act?\ncar manufacturers had to make smaller cars.\ncleaner - burning gas had to be used in cars.\ndrivers had to drive shorter distances.\ncar manufacturers had to make electric cars.
Answer
Brief Explanations:
The Clean Air Act aimed to reduce air - pollution from cars. Using cleaner - burning gas helps in reducing emissions. Making smaller cars doesn't directly relate to clean air. Requiring drivers to drive shorter distances is not a requirement of the act. Making electric cars was not an immediate requirement when the act was first passed.
Answer:
Cleaner - burning gas had to be used in cars.