Leaded Gasoline Was Known to Poison From Day One — Industry Shipped It Anyway

In 1921, GM engineer Thomas Midgley Jr. identified tetraethyl lead (TEL) as an additive that suppressed engine knock, and by 1923 it was being pumped at filling stations. The technical problem was real — knocking hurt efficiency and unsettled buyers — but effective alternatives existed, most notably ethanol. GM and allied oil interests rejected ethanol precisely because it was unpatentable and uncontrollable, while TEL could be owned and monetized. The compound’s toxicity was not a later discovery: lead poisoning was understood in 1854, a Du Pont executive described TEL in 1922 as almost immediately poisonous through skin contact, and Midgley himself was bedridden with lead poisoning when the first tank was sold.

Early warnings were dismissed rather than heeded. Five workers died from TEL exposure at a Standard Oil refinery in 1924, yet a 1926 public health review concluded there was no reason to ban the fuel as long as production workers were protected, judging driver and bystander exposure tolerable and explicitly punting rising future exposure to “another generation.” That precedent held until the mid-1970s, when accumulating evidence pushed the EPA into a prolonged legal fight to phase leaded gasoline out.

The lasting damage falls hardest on children, whose developing systems are most vulnerable — research ties childhood lead exposure to lower IQ, behavioral problems, learning disabilities, and elevated violent crime. Much of the lead spread through decades of exhaust remains in the soil and dust of contaminated environments. The story is a durable case study in how patentability and market control, not safety or available alternatives, can drive a technology decision with generational consequences.