Residents said the air attacks resulted in non-stop explosions from weapons caches in those targeted military camps.
Daesh said people were committing a "dangerous major sin" by bringing children to the West, where "they are under the constant threat of fornication, sodomy, drugs and alcohol".
The advice covers the journey beyond Greece to Macedonia, Serbia, Hungary and Western Europe.
"We have had sandstorms before, but not of this intensity. It's very rare for this time of year too and it's covering the entire region," a Cypriot metrological office official told.
Topics to be discussed - on November 4 and 5 at the Emirates Palace - include information security for "smart cities", cybercriminal threats, and the cyber threat to critical infrastructure such as oil and gas platforms.