If possible, buy these organic:
1 Strawberries 2 Spinach 3 Nectarines 4 Apples 5 Grapes 6 Peaches 7 Cheries 8 Pears 9 Tomatoes 10 Celery 11 Potatoes 12 Sweet Bell Peppers 13 Hot Peppers Summarized from https://www.ewg.org/foodnews/dirty-dozen.php