Hi evgeny,
Iām from Israel, & I can tell you for sure, there is no salt in the air near the Dead Sea, The water is very smooth and there are no big waves like you know from the ocean.
At this time of the year, your only concern will be dust.
The water is very salty & greasy, if your going to take a photo using a tripod in the water, make sure to wash it extremely well.
Moti.