Imports In 2008, Saint Vincent and the Grenadines imported $4.01k 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 Saint Vincent and the Grenadines. Saint Vincent and the Grenadines imports Macadam of slag, dross or similar industrial waste primarily from: N/A.