Narrative:

Descending into ZZZ; the controller was very difficult to understand. It sounded like he was wearing a mask while attempting to communicate. Every instruction we were given I had to verify. Some instructions were more or less difficult to decipher than others. Due to the divisiveness associated with the mask issue; I chose not to remark on the radio about not being able to clearly understand all of the instructions. I simply verified each instruction while clearly annunciating.inability to understand ATC instructions appears to be a safety threat. I have no way of knowing if the controller was wearing a mask or not; but all other transmissions from other aircraft and other controllers were clear. I have heard that controllers may begin to wear them; but that is unverified. In the event that this is the case it presented a clear barrier to communication; which seems to pose a significant safety threat.

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Original NASA ASRS Text

Title: Air carrier Captain reported difficulty understanding ATC instructions possibly due to the Controller wearing a face mask.

Narrative: Descending into ZZZ; the Controller was very difficult to understand. It sounded like he was wearing a mask while attempting to communicate. Every instruction we were given I had to verify. Some instructions were more or less difficult to decipher than others. Due to the divisiveness associated with the mask issue; I chose not to remark on the radio about not being able to clearly understand all of the instructions. I simply verified each instruction while clearly annunciating.Inability to understand ATC instructions appears to be a Safety threat. I have no way of knowing if the Controller was wearing a mask or not; but all other transmissions from other aircraft and other Controllers were clear. I have heard that controllers may begin to wear them; but that is unverified. In the event that this is the case it presented a clear barrier to communication; which seems to pose a significant Safety threat.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.