Definition: The amount of actual toxic material(s) present in a formulation, used when discussing the ingredients of pesticides.
Also Known As: ai
active ingredient
By Kelly Burke, About.com Guide
Explore Lawn Care
Must Reads
About.com Special Features
Holiday Central
What to eat, where to go, fun things to do and how to save money on the perfect gifts. More >
Make Your Own Scented Pine Cones
Bring a little of the fall season in your home with this easy-to-make craft. More >
©2009 About.com, a part of The New York Times Company.
All rights reserved.