Ata,

We only derive BEs for environmental exposures. For occupational exposures, you are best to rely on the ACGIH BEIs.  

Regards,

Sean

Dear Dr. Hays

I do appreciate you for your contribution and also for your valuable comment.

Regard,

Ata

Dear Dr. Koch

I do appreciate you so much for your great responsibility, kindness, and consideration, which shows your professionalism. At the same time, I also record my thanks for your great guidance and help.

Wish you health and happiness

Yours sincerey,

Ata