Question

Since when has it been illegal to vent any refrigerant including substitutes for CFC, HCFC, and HFC refrigerants?

1) Before 1990
2) After 1990
3) Before 2000
4) After 2000

Answer 1

It was legal to vent refrigerants including substitutes for CFC, HCFC, and HFC refrigerants before 1990.

Step-by-step explanation:

Before 1990, it was not illegal to vent refrigerants including substitutes for CFC, HCFC, and HFC refrigerants. However, global concern about the destruction of the ozone layer led to the establishment of the Montreal Protocol agreement in 1987.

This agreement aimed to phase out the production and use of CFCs and other ozone-depleting substances. As a result, CFCs have been mostly phased out since 1995, although they were still used in developing nations until 2010. Therefore, the correct option is 1) Before 1990.