The clean air act of 1963 was an improvement over the air pollution control act of 1955 because it
provided twice as much money for the study of air pollution
set limits on emissions from factories
set limits on emissions from vehicles
prevented the deforestation of national parks

Correct

set limits on emissions from factories

The Air Pollution Control Act of 1955 was the first federal legislation related to air pollution.

The Clean Air Act of 1963 established a federal program within the US Public Health Service. and authorized the investigation of techniques to monitor and control air pollution in factories.

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