Which of these typically containers higher toxin levels when conventionally farmed?

  1. Grapes
  2. Avocados
  3. Kale
  4. Asparagus

Answer: c. Kale

Kale, and hot peppers are often treated with unusually toxic chemicals. Though other items on EWG’s ‘Dirty Dozen List’ have a wider variety of chemicals or higher concentrations, it is worth noting that leafy greens often contain exceptionally toxic insecticides and weed killers that are no longer used on other produce.
http://www.ewg.org/foodnews/