You can't fly if you can't see

Harmattan has bitten so hard we are grounded. On Sunday we could not even see the hangars at 200m.... since Sunday morning we have only had ten minutes of legally flyable viability - and we did go up - only to come back to earth as we could see another wall of sand filled air approaching the field like a blanket being laid gently onto a baby's cot. The mountain at the end of our runway is jsut 3km from the threshold - and when we cannot distinguish the rocks on the face of that mountain, we CANNOT fly.., not just because of the lack of visibility by also due to the amount of sandy dust that enters the mouth of the crew and the engine of the plane... this looks like it has set in for the next few weeks at least.