Every year, the USDA’s Pesticide Data Program publishes a report on pesticide residues found on a variety of food products. These detections, measured on >10,000 samples from across the country, tend to be below EPA tolerance levels. As such, the products are probably safe for human consumption. However, it’s still interesting to see which foods, particularly fruits and vegetables, have detectable levels of pesticides. Unless you’re sure your food is organic, you can use this graph to see which produce has a greater diversity of pesticides, and which items are generally pesticide free. Products like spinach and strawberries often have a lot of pesticides, and may be better purchased organic. Oranges and grapefruits are usually pretty clean, even when conventionally grown.

Data source: https://www.ams.usda.gov/sites/default/files/media/2015PDPAnnualSummary.pdf