These then react with the ozone molecules, resulting in their removal. CFCs have a lifetime in the atmosphere of about 20 to 100 years, and consequently one free chlorine atom from a CFC molecule can do a lot of damage, destroying ozone molecules for a long time.
exists and is an alternate of . In the northern hemisphere of Earth, Fall begins on the Autumnal equinox (22-23 September) (in Persian calender it will begin at the first day of Mehr) and ends on the Winter solstice (21-22 December). In the southern hemisphere of Earth, Fall begins on the Autumnal equinox (20-21 March) and ends on the Winter solstice (20-21 June).
Rating Newest Oldest. Best Answer: Officially, the third week of September when Fall starts all over the U.S at the autumnal equinox - this year it is September 22nd. And you can find this answer easily through many other methods, like simply googling when does fall start.. You'd be surprised how google search can answer questions.