Part H

A global awareness of a need to decrease the amount of chlorofluorocarbons $($CFCs$)$ ocourring in the atmosph came about in the $1970$s and $1980$s$.$ Observation of which of the following conditions led to this awareness?

View Available Hint$($s$)$

an increase in the amount of ozone over Antarctica in March to April every year

a decrease in the amount of ozone over Antarotica in March to Aprlf every year

a decrease in the amount of orone over Artarctica in June to July every year

an increase in the awount of orone over Antaretica in September to October every year

a decrease in the amount of ocone over Antarctica in September to October every year