Singapore Becomes First to Levy Passenger Tax for Sustainable Aviation Fuel.Singapore implements the world's first green fuel levy on passengers; the tax starts October 2026 to fund a 1% SAF mandate.Jan 27, 2026•3 min•Sustainable Aviation FuelSAF LevyCAASAviation DecarbonizationSingapore Changi AirportENVIRONMENTAL