The top 10 toxic chemicals suspected to cause autism and learning disabilities

1. Lead
2. Methylmercury
3. PCBs
4. Organophosphate pesticides
5. Organochlorine pesticides
6. Endocrine disruptors
7. Automotive exhaust
8. Polycyclic aromatic hydrocarbons
9. Brominated flame retardants
10. Perfluorinated compounds
The National Academy of Sciences reports that 3 percent of all neurobehavioral disorders in children, such as autism spectrum disorder (ASD) and Attention Deficit Hyperactivity Disorder (ADHD), are caused by toxic exposures in the environment and that another 25 percent are caused by interactions between environmental factors and genetics.
The papers are free to read. One paper found evidence linking smoking during pregnancy to Asperger’s disorder and other forms of high-functioning autism; two show that PCBs disrupt early brain development; and a fourth suggests further exploring the link between pesticide exposure and autism.