Question

Ozone layer of upper atmosphere is being destroyed by ______.

Options

• SO₂

• photochemical oxidants

• CFC’s

• smog

Answer 1

Ozone layer of upper atmosphere is being destroyed by CFC’s.

Explanation:

When CFCs (commonly used in older refrigerants and aerosol sprays) reach the upper atmosphere, ultraviolet (UV) radiation breaks them down, releasing chlorine atoms. A single chlorine atom can destroy thousands of ozone molecules (O₃), thinning the protective ozone layer and allowing harmful UV radiation to reach the Earth’s surface.