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Apples are the most chemically contaminated produce, says a new report by the Environmental Working Group, a non-profit focused on public health.

The report suggests buying organic apples instead of conventional, and names other fruits and vegetables that rank highest in pesticides. Organic produce is grown using materials of plant or animal origin, instead of chemicals. On the “dirty dozen” list are:

1. Apples

2. Celery

3. Strawberries

4. Peaches

5. Spinach

6. Imported nectarines

7. Imported grapes

8. Sweet bell peppers

9. Potatoes

10. Domestic blueberries

11. Lettuce

12. Kale/collard greens

The group also lists the “Clean 15,” or those that rank lowest in pesticide residues. These are:

1. Onions

2. Sweet Corn

3. Pineapples

4. Avocado