A study of more than 2 million children has found that autism is more common among those whose mothers were exposed to raised sulfate or ammonium pollution during pregnancy. Exposure to ozone early in life was also a factor. The rate of increase was modest, indicating none of these was the largest factor in autism diagnosis. Nevertheless, the association in a study of this size is much more evidence than has ever been found for childhood vaccines or Tylenol, but similar responses are unlikely. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Autism has become an obsession for US Secretary of Health and Human Services Robert F. Kennedy Jr and many of the people appointed to the highest levels of the US health administration. This has man

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