In the United States when were R-22 and R-124b phased out?

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Multiple Choice

In the United States when were R-22 and R-124b phased out?

Explanation:
The key idea is how ozone-depleting refrigerants are phased out over time under regulatory schedules. R-22 and R-124b are HCFCs, substances targeted for phaseout to protect the ozone layer. In the United States, the final step of that phaseout for virgin production and import was set for 2020. After that year, new production and import of virgin HCFCs ended, meaning servicing could only rely on reclaimed/recycled refrigerants or equipment using alternative, non-ozone-depleting refrigerants. Earlier dates mark restrictions or freezes, not the complete end, and dates later than 2020 miss the actual deadline.

The key idea is how ozone-depleting refrigerants are phased out over time under regulatory schedules. R-22 and R-124b are HCFCs, substances targeted for phaseout to protect the ozone layer. In the United States, the final step of that phaseout for virgin production and import was set for 2020. After that year, new production and import of virgin HCFCs ended, meaning servicing could only rely on reclaimed/recycled refrigerants or equipment using alternative, non-ozone-depleting refrigerants. Earlier dates mark restrictions or freezes, not the complete end, and dates later than 2020 miss the actual deadline.

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