This report by the US non-profit Environmental Working Group analyses pesticide residue data from the US Department of Agriculture. It concludes that around 70% of produce in the US is sold with pesticide residues, with particularly high levels in strawberries, spinach and kale and relatively low levels in avocados, sweetcorn and pineapples.
The report does not specify how the detected pesticide levels compare to recommended maximum exposure levels. It notes that the US Environmental Protection Agency’s risk assessments of the health impacts of pesticides do not account for interactions between multiple pesticides.
Read the report, EWG's 2019 Shopper's Guide to Pesticides in Produce™, here. See also the Foodsource resource How are food systems and health connected and influenced?