Technically none of the 'Thin Series' from 2012 onwards have this issue unlike the 2011 and back have a dust issue.
But! Apple has had a few bumps with the display makers with insects caught in the sealed sandwich.
The first versions had a small weep hole so the atmospheric pressure could be equalized which maybe how the little guys got in. The newer models have a more breathable foam which should be better unless the insect bores its way though.
I suspect the newest infestation was the foam tape was not properly sealed so sitting on the shelf the insects made a home only to discover to be on the inside surface of a sealed space.
In any case Apple has been good in replacing displays which have evidence of insect infestation.