Low-sulfur and high-sulfur crude oil are categorized by sulfur 

content, which refers to the weight percent of sulfur (either sulde 

or elemental sulfur) contained in a crude oil. Sulfur impacts the 

quality of a crude oil because it causes diculties in processing the 

oil, such as corrosion of metals, and air pollution from the burning 

of high-sulfur fuels. Generally, most crude oils contain a low level 

of sulfur. Based sulfur content, crude oil can be classied as lowsulfur (“sweet”), medium-sulfur, and high-sulfur crude oils (the 

latter two are often referred as “sour”), respectively containing less 

than 0.5%, between 0.5% and 2.0%, and more than 2.0% of sulfur 

by weight.

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