Question

how ozone molecules is formed in the atmosphere

Answer 1

When atmospheric oxygen rises in the upper layers it reacts with O- ions and forms O3

O2+O-->O3

Answer 2

Ozone is formed throughout the atmosphere in multistep chemical processes that require sunlight. In the stratosphere, the process begins with an oxygen molecule (O2 ) being broken apart by ultraviolet radiation from

the Sun. In the lower atmosphere (troposphere), ozone is formed in a different set of chemical reactions

involving hydrocarbons and nitrogen-containing gases.