The Environmental Working Group (EWG) just released their new Clean 15 and Dirty Dozen lists. Here's what that means:

And in case you're curious, here are the two full lists:
Clean 15: sweet corn, avocados, pineapples, cabbage, onions, sweet peas frozen, papayas, asparagus, mangos, eggplant, honeydew melon, kiwi, cantaloupe, cauliflower, grapefruit
Dirty Dozen: strawberries, spinach, nectarines, apples, peaches, pears, cherries, grapes, celery, tomatoes, sweet bell peppers, potatoes