${{O}{2}}$ gas is used up for combustion, respiration, etc.
${{O}{3}}$ gas absorbs harmful ultraviolet radiations from the sun which if reach the surface of the Earth may lead to damages and diseases.
${{O}{2}}$ gas is used up for combustion, respiration, etc.
${{O}{3}}$ gas absorbs harmful ultraviolet radiations from the sun which if reach the surface of the Earth may lead to damages and diseases.