Possible carcinogen
Encyclopedia
Possible carcinogen is a category of the dangers of chemical exposure as recognized by the United States Environmental Protection Agency‎ (EPA).

This is as opposed to "probable" or "known" carcinogen
Carcinogen
A carcinogen is any substance, radionuclide, or radiation that is an agent directly involved in causing cancer. This may be due to the ability to damage the genome or to the disruption of cellular metabolic processes...

under EPA classifications of carcinogenicity.

As of 2011 approximately 900 agents have been studied to determine if they are carcinogenic, with 267 being classified as possibly carcinogenic to humans as opposed to only 1 being classified as probably not carcinogenic to humans. Agents currently listed as possible carcinogens include: coffee, coconut oil, cobalt, and nickel.

In 2002 the EPA found that diesel is a "probable" carcinogen. http://www.cbsnews.com/stories/2002/08/29/health/main520195.shtml.
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