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Answer:
CFCs increased
CFCs slowly decreased
reduced asthma rates
Explanation:
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The amount of CFC in for the years 1975-1991 was increased and for 1991-2015 was decreased and causes lungs and skin deseases.
What is CFC?
CFC stands for 'chloro flouro carbon', as the name suggested that in CFC chlorine atoms, flourine atoms and carbon atoms are present.
As in the question it is mention that CFC's are emitted out from many cooling machines and is hazardous for environment as well as for health also. As it damages the ozone layer as a result of which UV rays will come to the earth and may cause skin deseases or skin cancer to humans in addition to lungs deseases.
It is also mentioned that it was banned in the world in the year 1987, so for the years 1975 to 1991 its concentration in the environment increases but after banning it gets reduced in the year 1991 to 2015.
Hence concentration of CFC first increases (1975-1991) and then gets reduced (1991-2015) and have affect on lungs and skin deseases.
To know more about CFC, visit he below link:
https://brainly.com/question/10583810