http://www.english.hadhramaut.info Met warns of influx of dust-laden air masses over the next 48 hours. [The Source: /www.sabanews.net/hadhramaut.info - 13/04/2009] The National Meteorological Center today warned of flow of  heavy block   dust-laden air coming from the center of the Arabian Peninsula to a number of govern orates of Yemen during the past 48 hours. A Bulletin from  the Center received by Yemen News Agency (SABA )  said that  likelihood   the areas going to be affected are the provinces of Al-Jawf , Sa'ada ,northern parts Al-mahra provinces , Hadramout, Marib, Amran and Sana’a.  These air masses, leading to a significant decrease in horizontal visibility up to less than one kilometer in the coming hours.It called on  the citizens in the provinces mentioned, especially drivers of vehicles to be cautious in dealing with very low horizontal visibility, warning patients of Chest problems , the elderly and children not to have direct exposure to dust because of the damage going to cause   to general health