Have you ever wondered which foods you should be buying organic and which produce tends to use very little pesticides? When shopping this could cut your total cost in half, so FoodNews did the research to help you help you stay on budget and chemical-free (or at least lower your exposure).

Here are the “Dirty Dozen” fruits and vegetables, listed in descending order for presence of pesticides, starting with the worst, or highest pesticide load:

- Peaches (highest pesticide load)

- Apples

- Sweet bell peppers

- Celery

- Nectarines

- Strawberries

- Cherries

- Kale

- Lettuce

- Grapes (imported)

- Carrots

- Pears

Here are the “Clean 15″ – the least amount of pesticides found, in descending order with the cleanest first:

- Onions (lowest pesticide load)

- Avocado

- Sweet corn (frozen)

- Pineapple

- Mango

- Asparagus

- Sweet peas (frozen)

- Kiwi

- Cabbage

- Eggplant

- Papaya

- Watermelon

- Broccoli

- Tomato

- Sweet potatoes

Source: Environmental Working Group; www.foodnews.org