Problem statement: Dust continued to blow across northern Africa and the MediterraneanSea on March 3, 2005. Many sources are associated with areas where human impacts are welldocumented. Approach: Nonetheless, the largest and most active sources are located in truly remoteareas where there is little or no human activity. Dust activity is extremely sensitive to manyenvironmental parameters. Results: The persistent sources are located in the Northern Hemisphere,mainly in a broad
