I just read an article about the transportation of Saharan dust from Africa to South America and the Caribbean. It said that there was enough dust coming over that it exceeded the world health organization's limits. This means that the air become difficult to breathe. I do not believe that this is such a huge problem. I was recently in the US Virgin Islands and I experienced the dust. It was to the point where you could see it in the air when you were on the ocean but other then that you would have never known it was there! This has been going on for years so I don't think anything can be done about except to wear masks if its really that bad!
http://www.sciencedaily.com/releases/2014/08/140819094059.htm
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