Petroleum products are here, there, everywhere, even if you don't live in the Gulf. The Washington Post reports via Planet green:
Federal regulators, who are charged with ensuring the safety of food and consumer products, are in the dark about the suspected chemical, 2-methylnaphthalene. The Food and Drug Administration has no scientific data on its impact on human health. The Environmental Protection Agency also lacks basic health and safety data for 2-methylnaphthalene -- even though the EPA has been seeking that information from the chemical industry for 16 years.
How to avoid these awful contaminants? Buy real food from people you know, make what you need. I have a chicken stock bubbling on the stove right now from a chicken I helped to gut and clean, veggies from the same organic farm--and it's all the parts of the veggies we could have discarded. And it smells heavenly!