The Environmental Working Group (EWG) has released their always helpful Dirty Dozen and Clean Fifteen lists for 2017.
The fruits and vegetables on the Dirty Dozen list include (with the most contaminated food on the Dirty Dozen list at the top):
Sweet Bell Peppers
The fruits and vegetables on the Clean Fifteen list include (with the least contaminated food on the Clean Fifteen list at the top):
Sweet peas (frozen)
Visit https://www.ewg.org/foodnews/summary.php to learn more about the EWG's Dirty Dozen and Clean Fifteen lists.