Expression: None of my concern/concerns

[Tom]

Hi

Could you please tell me which one is correct?

1- Well, this is none of my concern.
2- Well, this is none of my concerns.

Tom

[Yankee]

Hi Tom

It's none of my concern. sounds good.

Amy

[Torsten]

I think it follows the same pattern as

It's none of your business.
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Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary

[Tom]

Thank you, Amy and Torsten for your valuable comments!

One thing more struck me right now!

What about affair?

- It's none of my affair!
- It's none of my affairs!

Tom

[Yankee]

Hi Tom

I'd say "It's none of my affair" would so unusual that you shouldn't use it.

"It's not my concern" is probably more common than "It's none of my concern."

And "It's none of my businsess" is the most common.

Amy