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- ...ighter liquid hydrocarbons, and has a relatively low level of impurities. Sulphur is the most common impurity in oil and gas, and, if it is not removed before the fuel is burned, it forms [[sulphur dioxide]]s when burned, which fall as [[sulphuric acid]] when precipitated -- one o4 KB (646 words) - 19:40, 29 July 2012
- ...(collected by CDIAC)</ref><ref>Human-produced, direct emissions of carbon dioxide only. Excludes other greenhouse gases; land-use, land-use-change and forest ...smog is becoming an increasingly rarer phenomenon and levels of [[sulphur dioxide]] are decreasing.<ref>{{Cite web|title=Environment and Health in Italy –352 KB (48,531 words) - 12:03, 8 December 2021
