A study by the Environmental Protection Agency looked at the costs and benefits of the Clean Air Act from 1970 to 1990. This study found that a middle-range estimate of the health and other benefits from cleaner air was $22 trillion. This amount was about than the costs of reducing the pollution.

44 times higher.

Explanation:

The economists estimated that the cost of clean air and reducing the pollution was nearly $500 billion but the benefits from cleaner air were $22 trillion which is 44 times higher. This study was presented by Environmental protection agency for the cost and benefit of the Clean Air Act 1970 to 1990. The benefits of clean air will enable people to live long and healthy life. The industries which ultimately rely on clean air will benefit from it resulting in increased profits.  

answerimplicit;