The Environment Working Group, in conjunction with the Dept. of Agriculture has released its 2013 list of the Dirty Dozen: They are (after testing 28,000 samples):
Apples; Celery; Cherry Tomatoes; Cucumber; Grapes, Hot Peppers; Nectarines (imported); Peaches; Potatoes; Spinach, Strawberry, Sweet Bell Peppers; Kale/Collard Greens; Summer Squash.
They note that Kale/Collard Greens and Squash do not necessarily meet their standards to be "dirty" but are noted to in some cases contain higher than normal levels of pesticides - toxic to the nervous system.
You can also see their "clean list" at ewg.org
Thanks for signing up!
Connect with us to get more Food52!
Sign up for our useful, inspired emails and we'll give you everything you need to eat and live better—including recipes, how-tos, and exclusives and great gift ideas from our kitchen and home shop.