EPA regulations require that commercial and industrial process refrigeration systems containing more than how many pounds of refrigerant must be repaired when the annual leak rate exceeds 35%?

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The key idea is that EPA requires leak repairs for larger commercial/industrial process refrigeration systems when leaks become frequent enough to be a big problem. Specifically, if a system contains more than 50 pounds of refrigerant and its annual leak rate is greater than 35%, repairs must be performed. The annual leak rate is the percentage of the system’s refrigerant that is lost to leaks in one year (annual leakage divided by the system’s total charge, times 100). This threshold focuses repair obligations on larger systems where leaks contribute more to emissions. The other options pair different charge amounts with leak percentages that don’t align with this regulation.