Scoot tops Cirium’s 2025 EmeraldSky emissions ranking with 51 g CO2/ASK; Qatar and Ryanair follow
Scoot, based in Singapore, was named the world’s most emissions-efficient airline in Cirium’s 2025 EmeraldSky Annual Review, recording 51 g CO2/ASK. The ranking places Qatar and Ryanair among the leading carriers globally, reinforcing performance differentiation through measurable emissions intensity.