Yikes! Why lowering air pollution is such a vital priority –
Investigators studied the Center for Disease Control and Prevention (CDC) data on 4,486 children with ASD residing in 2,489 census tracts across the country. They used an overlay of the Environmental Protection Agency regional air pollution data to determine if air concentrations of various metals could be connected with autism prevalence and found strong correlations between ambient concentrations of lead, mercury and arsenic and the occurrence of ASD. Tracts with air concentrations of lead in the highest quartile had significantly higher ASD prevalence than tracts with lead concentrations in the lowest quartile. In addition, tracts with mercury concentrations above the 75th percentile and arsenic concentrations below the 75th percentile had a significantly higher ASD prevalence compared to tracts with arsenic, lead and mercury concentrations below the 75th percentile.