Imports In 2006, Syria imported $12k in Macadam of slag, dross or similar industrial waste, becoming the 0th largest importer of Macadam of slag, dross or similar industrial waste in the world. At the same year, Macadam of slag, dross or similar industrial waste was the 0th most imported product in Syria. Syria imports Macadam of slag, dross or similar industrial waste primarily from: N/A.