Specification is a better choice of words.
Sand has a lot of silica in it which translates into lapping compound on the inside of an engine. It's one of the tests run on engine oil samples to tell if the air filtration is working well. Too much silica in the oil and you start looking for the cause, whether it might be a tear or hole somewhere in the intake ducting, or a lousy filter. Since the lubricating oil on a 2-stroke is always fresh and never recycled, is it really that much of a concern on the air filtration? Would I have to eventually worry about clogging any carb passages?