This link shows what gives me some problems during the year. The Saharan dust comes and goes, but when it's here, my sinuses react. Sometimes it's minor, but other times leads to some antihistamines, and annoying sinus problems. During the times with lots of pollens, it only makes things worse.
The bright side of having the dust is it can weaken, or prevent the formation of a hurricane. From my perspective, it's a good trade.