What is the required air temperature for refrigerated storage?

The required air temperature for refrigerated storage is 4 degrees Celsius. This temperature is crucial for maintaining food safety, as it helps to slow down the growth of pathogenic bacteria that can cause foodborne illnesses. Keeping food at or below this temperature ensures that it remains fresh and safe for consumption.

Storing food at higher temperatures, such as those indicated in the other choices, increases the risk of bacterial growth, which can lead to spoilage and health risks. Thus, maintaining refrigerated areas at 4 degrees Celsius is a critical practice in food safety at establishments like McDonald's, where proper food handling and storage practices are essential for customer safety and satisfaction.