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In produce aisles across America, shoppers face the same conundrum over and over again: Buy organic to avoid pesticides, or save money and just get the cheaper stuff?

There's no one-size-fits-all answer.

Pesticide use on fruits and vegetables varies from one crop, region, and grower to the next, and buying organic doesn't always guarantee a food will be pesticide-free. (The USDA permits organic farmers to use certain pesticides; also, chemicals applied to conventional crops can drift onto plots of certified-organic food.)

Pesticide exposure likely isn't as dangerous as many advocacy groups claim, and washing all produce can limit exposure. Still, there is some evidence that pesticides may affect the health of kids.

"Even low levels of pesticide exposure can be harmful to infants, babies, and young children," Dr. Phillip Landrigan, a pediatrician and epidemiologist at the Mt. Sinai School of Medicine in New York, told USA Today. "[S]o when possible, parents and caregivers should take steps to lower children's exposures to pesticides while still feeding them diets rich in healthy fruits and vegetables."

One way to cut through the noise is the Pesticide Data Program run by the US Department of Agriculture (USDA). The program targets foods most commonly eaten by children, collects thousands of samples nationwide, tests them for pesticide residues, and annually releases its findings to the public and government agencies.

The program's reports can run hundreds of pages long, however, so each year a non-profit called the Environmental Working Group (EWG) compiles the data into its "dirty dozen": a list of conventionally grown produce items with the worst track records when it comes to pesticide residues — and the ones EWG therefore recommends you buy organic.

We've provided EWG's 2017 results below. Each crop is scored and ranked based on six criteria, including the amount and variety of trace pesticides found.

While not an end-all, be-all answer, it's a handy guide for those who don't have time to sit down and pore over the latest USDA dataset.

1. Strawberries

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About 98% of strawberries sampled by the USDA had at least one pesticide on them, and one sample showed the presence of 20 different pesticides.

2. Spinach

Kristine Mahan

Spinach ranked 8th in EWG's 2016 "dirty dozen" list but moved up six spots this year.

"Spinach samples had, on average, twice as much pesticide residue by weight than any other crop," according to EWG.

3. Nectarines

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4. Apples

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About 49 out of 50 apples sampled by the USDA also tested positive for at least one kind of pesticide residue.

6. Pears

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Pears moved up from #22 to #6 in just a year because pesticide use has doubled on the crop since 2010.

7. Cherries

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9. Celery

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10. Tomatoes

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11. Sweet bell peppers

Flickr / David Lenker

12. Potatoes

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BONUS: Hot peppers

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While EWG says hot peppers don't meet its "traditional ranking criteria," it noted that "USDA tests of 739 samples of hot peppers in 2010 and 2011 found residues of three [...] insecticides — acephate, chlorpyrifos and oxamyl — on a portion of sampled peppers at concentrations high enough to cause concern. These insecticides are banned on some crops but still allowed on hot peppers."