CHST Worksite Audit Practice Test 2026 - Free CHST Practice Questions and Study Guide

Parathion’s development traces back to IG Farben, the large German chemical conglomerate known for its extensive organophosphate research in the early 20th century. This group, which included several major firms that later emerged as Bayer and others, conducted the work that led to parathion as one of the early highly toxic pesticides. After World War II, IG Farben was dissolved and its successor companies continued in various forms, but the original creation is attributed to IG Farben rather than the American firms listed. The other companies did not originate parathion, even though they produced or marketed pesticides later on.