What so shamals and simooms have in common?

Simoom is a strong, dry, dust-laden wind usually used to describe a local wind to blows in the Sahara, Palestine, Syria, Jordan and the Arabian Peninsula. It can exceed 54 degrees C and the humidity can drop bellow 10%.
Shamal is a northwesterly wind blowing over Iraq and Persian Golf states, very often strong during the day, but decreasing at night. This wind occurs anywhere from just once, to several times a year, and it creates large sandstorms.
The similarities between these two winds is that they are strong, dry winds, that cause sandstorms.

None of them. they are likely to occur on any plate boundary