I'll start making sand storm.
I think I should make it with Niagara. So I just have started to learn Niagara
https://www.youtube.com/watch?v=AGOV-72ytig
https://www.youtube.com/watch?v=_MD0s_cfS24
https://www.youtube.com/watch?v=o-MXAmfCY5U
Dust and Smoke Effects：エフェクト - UE マーケットプレイス
Also there is a sand dust in marketplace.
I guess Volmetric Fog is also helpful to make an environment of sand storm