Toxins from industrial factories have gone down by 90 degrees % since the passage of which law?

Clean air Act

Explanation:

The clean air act was initially created in 1963, as an effort by the federal government to reduce the air pollution on national level. These national pollution contained a lot of toxins from the residual of industry related activities.

The clean air act created strong regulations that must be followed by the companies to manage their waste disposal. Since the act will make the companies legally subjected to lawsuit if they follow the regulations, it led to a massive decrease in the amount of air pollutant within the country.

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