The analysis, based on produce samples tested by the U.S. Department of Agriculture, found that strawberries and spinach contained the highest amounts of pesticide residues. One sample of strawberries, for example, tested positive for 20 different pesticides, and spinach contained nearly twice the pesticide residue by weight than any other fruit or vegetable.
The two types of produce topped the EWG ranking of the 12 fruits and vegetables with the highest concentrations of pesticides—the so-called “Dirty Dozen.” After strawberries and spinach come nectarines, apples, grapes, peaches, cherries, pears, tomatoes, celery, potatoes and sweet bell peppers. More than 98% of peaches, cherries and apples contained at least one pesticide.