Chris,

It's doable, but as a practical matter for most modern cars - even trucks - it would not be a trivial job. And if the airborne stuff is that prevalent, seeing where you are going is a serious problem. Afterwards, driving thru the stuff on the roads, the same or worse air intake problem presents itself, depending on where your air intake is located. A simple snorkle kit works fairly well in those sorts of dusty conditions if you are not following too closely behind another vehicle. Duct tape and some 4" PVC (smaller diameter OK if we're talking < 5 liter engine)... BUT you'll have to mess up some sheetmetal.

A cyclonic air "filter" ahead of your OEM intake and filter would greatly extend the useful life of your filter if you can find one small enough to function at your engine's airflow.

Look at some of the intake and filter set-ups on serious construction equipment like big Cat bulldozers.

HTH spark some ideas for you.

Tom