The dirty dozen list of produce is an annual ranking by the Environmental Working Group indicating which foods contain the most pesticides. The top five for 2015 are apples, peaches, nectarines, strawberries, grapes and celery. Spinach, cherry tomatoes, sweet bell peppers, cucumbers, imported snap peas and potatoes complete the list.
Nearly 100 percent of apple, peach and nectarine samples tested by the U.S. Department of Agriculture contained pesticides. However, by weight, a potato has more pesticides than any other produce.
At the other end of the spectrum, the Environmental Working Group also lists the Clean Fifteen. These kinds of produce are the least likely to have pesticide residue. The list includes avocados, sweet corn, pineapples, cabbage and frozen sweet peas.