The sale of small containers of refrigerant under __________ is restricted to certified individuals.

The sale of small containers of refrigerant under 20 lb is restricted to certified individuals to ensure that only trained professionals handle refrigerants. This regulation is in place because refrigerants can be harmful to both the environment and human health when not managed properly. By limiting the sale to certified technicians, the EPA aims to ensure that those who work with these substances have the necessary knowledge and skills to do so safely, comply with legal guidelines, and minimize the risk of accidental releases into the atmosphere. This requirement reflects a broader commitment to managing refrigerants responsibly and preventing issues related to ozone depletion and greenhouse gas emissions.