The Environmental Working Group rates produce each year based on pesticide residues.

The Dirty Dozen are the most contaminated and The Clean 15 are the produce items least likely to harbor pesticides

2020 Clean 15

1. Avocados

2. Sweet Corn

3. Pineapples

4. Onions

5. Papaya

6. Sweet Peas frozen

7. Eggplant

8. Asparagus

9. Cauliflower

10. Cantaloupe

11. Broccoli

12. Mushrooms

13. Cabbage

14. Honeydew Melon

15. Kiwi

* A small amount of sweet corn, papaya and summer squash sold in the United States is produced from genetically modified seeds. Buy organic varieties of these crops if you want to avoid genetically modified produce. Per the EWG

For the full list: https://www.ewg.org/foodnews/clean-fifteen.php