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"A lot of piston aircraft can't use leaded fuel in the future so they're looking for alternatives and ways we can decarbonise the lower end of aviation," he says.

A new study calculates that exposure to car exhaust from leaded gas during childhood altered the balance of mental health in the U.S. population, making generations of Americans more depressed, anxious and inattentive or hyperactive.

Mr Lloyd-Ham said it would be difficult to forget the heritage of the building, owing to its arched windows of mullioned stone and leaded glass.

The challenged California law bans the possession, manufacture, importation or sale of “any leaded cane, or any instrument or weapon of the kind commonly known as a billy, blackjack, sandbag, sandclub, sap, or slungshot.”

But the use of leaded gasoline in transportation fuel was never regulated for aircraft engines, the largest remaining source of lead emissions nationwide.