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
Sweet Peas frozen
* 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