"cc676fb2-cf17-413d-bb00-0b95d231f157" . "SULFUR OXIDES"^^ . "Sulfur oxides (SOx) can occur naturally from such sources as volcanoes,\nsulfur springs and decaying organic matter, or from anthropogenic sources\nsuch as fossil fuel combustion, brickworks, and spontaneous combustion in\ncoal mine spoil heaps. Sulfur oxides in the atmosphere are usually removed\nby acid rain."^^ . .