The EPA and Clean Air Act · US History

The 'Criteria Pollutants' regulated by the EPA under the Clean Air Act include all of the following EXCEPT:

  1. Carbon monoxide
  2. Ground-level ozone
  3. Particulate matter
  4. Inert helium gas
Show answer and explanation

Correct answer: Inert helium gas

Helium is an inert, non-toxic gas and is not considered a pollutant that harms human health. The EPA focuses on pollutants like sulfur dioxide and nitrogen oxides which cause respiratory issues and environmental damage.

Difficulty: Medium Question 11 of 20

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