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Onions are ranked the cleanest crop of 2012, (Credit: Fotolia)

Onions are ranked the cleanest crop of 2012, with less than 1 percent of samples testing positive for pesticide contamination.

The 2012 Clean Fifteen: Fruits and vegetables with the least pesticide contamiantion

These fruits and vegetables have earned their way onto the Environmental Working Group's "Clean Fifteen" list because they've been found to contain the lowest concentration of pesticide load. The ranking system is based on the group's analysis of more than than 60,700 samples taken from 2000 to 2010 by the U.S. Department of Agriculture and the U.S. Food and Drug Administration. The EWG suggests it is safe to buy the clean fifteen in their conventional form, rather than organic.

Onions are ranked the cleanest crop of 2012,
(Credit: Fotolia)

Onions are ranked the cleanest crop of 2012, with less than 1 percent of samples testing positive for pesticide contamination.

98 percent of all frozen and sweet corn
(Credit: USDA)

98 percent of all frozen and sweet corn samples had no detectable pesticide residue, a study shows.

Only 6 different pesticides were found on pineapples,
(Credit: MCT)

Only 6 different pesticides were found on pineapples, a study shows.

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Avocados have thick skins that protect the fruit
(Credit: AP)

Avocados have thick skins that protect the fruit from pesticide build-up, a study shows.

A study shows that cabbage doesn't retain a
(Credit: AP)

A study shows that cabbage doesn't retain a lot of pesticides because a minimal amount is needed to grow it.

According to the Environmental Working Group's 2012 review
(Credit: AP)

According to the Environmental Working Group's 2012 review of data released by the FDA and USDA, sweet peas are among the least likely vegetables present high pesticide contamination.

Asparagus is unlikely to contain a high concentration
(Credit: Newsday / Rebecca Cooney)

Asparagus is unlikely to contain a high concentration of pesticides by the time it reaches the supermarket shelf, a study finds.

Mangoes have thick skin, which goes a long
(Credit: AP)

Mangoes have thick skin, which goes a long way in preventing the inside of the fruit from pesticides, a study finds.

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According to a study, eggplants are among the
(Credit: Fotolia)

According to a study, eggplants are among the least likely vegetables to contain pesticides.

A study released on behalf of the Environmental
(Credit: AP)

A study released on behalf of the Environmental Working group says that cantaloupe contains a low levels of pesticides. The study was done off of data released by the USDA and the FDA in 2012.

Sweet potatoes are unlikely to be contaminated with
(Credit: AP)

Sweet potatoes are unlikely to be contaminated with pesticides, a study finds.

According to a study released by the Environmental
(Credit: iStock)

According to a study released by the Environmental Working group, watermelons have relatively low levels of pesticide contamination.

Mushrooms are unlikely to have high levels of
(Credit: Angela Gaul)

Mushrooms are unlikely to have high levels of pesticides when bought non-organically, a study shows.

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Click here to read more about the
(Credit: AP)

Click here to read more about the dirty dozen and pesticides in produce.

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