Dirty Dozen : Buy Organic, if possible

1. Strawberries
2. Spinach
3. Kale, collard and mustard greens
4. Nectarines
5. Apples
6. Grapes
7. Cherries
8. Peaches 
9. Pears
10. Bell and hot peppers
11. Celery
12. Tomato

Citation:  https://www.ewg.org/foodnews/dirty-dozen.php