What is the dirty dozen?

In 2013, the Environmental Working Group released an updated report that identified foods in the conventional, non-organic food supply that contained the highest number of pesticide residues. The worst offenders—which were nicknamed the "Dirty Dozen Plus"—included:

These are presented in descending order in terms of pesticide residue frequency (the uppermost food contains pesticide residues on the most frequent basis, and the next food down contains pesticide residues at the second highest frequency):

The "Plus" in the "Dirty Dozen Plus" refers to a new category that the Environmental Working Group added to their report this year. It reflects two types of produce that didn't meet the traditional Dirty Dozen criteria yet were of special concern. While they may not have been among the top 12 crops in which pesticide residues were found, these conventionally grown "Plus" crops were found to commonly be contaminated with organophosphate insecticides, which are considered to be highly toxic to the nervous system.

For the 2013 list, the "Plus" crops included:

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