Scoot tops Cirium’s 2025 EmeraldSky emissions-efficiency ranking; Qatar and Ryanair follow
Singapore-based Scoot was named the world’s most emissions-efficient airline in Cirium’s 2025 EmeraldSky Annual Review, recording 51 g CO2/ASK. Qatar and Ryanair placed next in Cirium’s global emissions ranking, reinforcing the link between modern fleet economics and lower unit emissions.