There is such a thing as the “dirtiest” food in your grocery store. And according to this year’s "Dirty Dozen," an annual list produced by watchdog organization Environmental Working Group (EWG), apples have ranked as the dirtiest foods — for the fourth year in a row, the Medical Daily reported.

Apples are the most pesticide-covered pieces of produce, the group said. The EWG gathered pesticide residue data from the U.S. Department of Agriculture on 48 different fruits and vegetables, discovering that 65 percent of produce tested positive for pesticides. 

According to the Environmental Protection Agency (EPA), pesticides can cause health problems including nerve damage, birth defects, and cancer. Children are especially vulnerable to the adverse effects of pesticides, because their internal organs are still developing.

Every single sample of imported nectarines — and 99 percent of apple samples — tested positive for at least one pesticide. Shockingly, a single grape contained about 15 pesticides. In addition to the Dirty Dozen, the EWG announced that leafy greens were ranked as a runners up with more dangerous pesticides that don’t fit in with the others. Leafy greens can include kale and collards as well as hot peppers.

Below you’ll find the full lists of dirtiest and cleanest items:

Dirty Dozen

1. Apples

2. Strawberries

3. Grapes

4. Celery

5. Peaches

6. Spinach

7. Sweet bell peppers

8. Nectarines (imported)

9. Cucumbers

10. Cherry tomatoes

11. Snap peas (imported)

12. Potatoes

Clean Fifteen

1. Avocadoes

2. Sweet corn

3. Pineapples

4. Cabbage

5. Sweet peas (frozen)

6. Onions

7. Asparagus

8. Mangoes

9. Papayas

10. Kiwis

11. Eggplant

12. Grapefruit

13. Cantaloupe

14. Cauliflower

15. Sweet potatoes