Why does the news think that the dust storms in that hit Phoenix only happen there and 2 other places?

As we have seen in the last two months there were 4 Dust Storms that hit the Phoenix Metro. Each time these hit the news would say that these types of storms only happen in Arizona, Northern Africa and parts of the Middle East. Problem is that Australia gets these too but it is never reported. Any reason why? Could it be that most are in the interior of the continent and don't really affect any major cities? And couldn't a dust storm happen almost anywhere in the world?
 
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