Every year the Environmental Working Group puts out it's list of the dirtiest and cleanest veggies. They base these ratings on analysis of tests produced from the Department of Agriculture. Each of those in the "Dirty Dozen" tested positive for a number of pesticide residues.
The real surprise this year was KALE! This learn-to-love cruciferous veggie wasn't tested by the USDA for over a decade. However, it's growth in popularity (among, err, some of us) has also brought with it a growth in both the level and number of pesticides found in kale crops. The "Clean Fifteen," on the other hand is the EWG's list of those crops with the fewest and least detectible levels of pesticides. These are the ones you DO NOT have to worry as much about buying organically. Below I have consolidated these two lists for you to print out and put on the fridge next to your grocery list!
Frozen sweet peas