For many, buying 100% organic is not an option either due to availability or budget constraints. In either of these cases, knowing which fruits and veggies are most or least contaminated in the growing process provides excellent ammunition when trying to make decisions while grocery shopping.
I got this list from EWG. The Enviromental Working Group is a Washington DC based team made up of scientists, engineers, policy experts, lawyers and computer programmers who make it their sole purpose to "use the power of public information to protect public health and the environment". Check them out on ewg.org. Their website has all types of great information!!
What are the dirty dozen you ask? They are the 12 fruits and veggies that leave the consumer most exposed to chemical toxins from pesticides and fertilizers.
This is the most current list in order of contamination--apples being the most contaminated.
Sweet Bell Peppers
What is the Clean Fifteen? The fifteen fruits and veggies that leave the consumer least exposed to chemical toxins from pesticides and fertilizers. I'm not saying don't buy these organic, but if the option is not there to buy organic, then "settling" is ok :) Buying organic whenever possible supports the environment and eliminates your consumption of chemical toxins through your food (which is always a good thing).
Here's the list with mushrooms being the cleanist.
Cantaloupe - domestic