An estimated 200 - 1,000 genes impact autism susceptibility. In comparison, autism cases linked to environmental exposures during early fetal development, such as prenatal exposure to valporic acid, are relatively rare

Autism is a genetic mutation that is in most cases hereditary.Autism can be caused by genetic and environmental factors, which sometimes interact. However, genetic causes are more common.

There have been studies that have gathered data that would seem to support your statement however correlation does not equal causation in this case. Its impossible to tell what chemicals any one individual had come into contact with. Its difficult to say for sure a cause because of many factors.

Gene mutation can* be caused by environmental factors however there is no report or study that says with certainty air pollution can be directly linked to causing autism.

You don’t get autism from the bad air you dumb motherfuckers. Its literally GENETIC.