Strawberries are once again first on a list of the 12 "dirtiest" fruits and vegetables issued by the nonprofit, nonpartisan Environmental Working Group.
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Every since 2004, the group has released its Shopper's Guide to Pesticides in Produce, which ranks pesticide contamination of 47 popular fruits and vegetables, CNN reported.
In order of contamination, the others in the top "Dirty Dozen" are: spinach, nectarines, apples, grapes, peaches, cherries, pears, tomatoes, celery, potatoes and sweet bell peppers.
Each of the top 12 items tested positive for pesticide residues and contained higher concentrations of pesticides than other produce, CNN reported.
While these 12 fruits and vegetables have the highest levels of contamination, nearly 70 percent of conventionally grown (non-organic) produce samples that were tested were contaminated, according to the Environmental Working Group.
There were some grocery-aisle winners, though, too. EWG also lists its "Clean 15" -- produce containing the least amount of pesticides. Avocados topped that list, followed by sweet corn, pineapples, cabbage, onions, frozen sweet peas, papayas, asparagus, mangoes, eggplant, honeydew melon, kiwi, cantaloupe, cauliflower and broccoli.
EWG notes that less that 1 percent of samples of either avocados or sweet corn tested positive for pesticides.
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