Environmental Protection Agency (EPA) MVAC Certification

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Study for the EPA MVAC Certification. Dive into key environmental regulations with multiple choice questions, hints, and detailed explanations. Get ready to excel on your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What is the average ozone concentration in Earth's atmosphere?

0.1 parts per million
0.2 parts per million
0.3 parts per million
0.4 parts per million

The correct answer is: 0.3 parts per million

The average ozone concentration in Earth's atmosphere is typically around 0.3 parts per million (ppm). This figure reflects the presence of ozone primarily in the stratosphere, where it forms the ozone layer that protects life on Earth by absorbing a significant amount of the sun's harmful ultraviolet (UV) radiation. This concentration is considered optimal for balancing the benefits of ozone in filtering UV rays while minimizing the potential for ozone-related pollution at ground level, where it can be harmful to human health and the environment. The values suggested by the other choices either underrepresent or overrepresent the average concentration found in the atmosphere, making 0.3 ppm the most accurate representation of global ozone levels.