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Distillates (petroleum), crude oil is a complex combination of hydrocarbons produced by distillation of crude oil. It consists of hydrocarbons having carbon numbers predominantly in the range of C11 through C50 and boiling in the range of approximately 205.degree.C to greater than 495.degree.C (401.degree.F to greater than 923.degree.F).

The initial threshold screening level (ITSL) for distillates (petroleum), crude oil is 19 μg/m3 based on an annual averaging time.