The International Civil Aviation Organisation (ICAO) Council has adopted stricter global environmental standards for aircraft, setting August 3, 2026, as the effective date and January 1, 2027 for worldwide implementation, mandating how new aircraft, including next-generation supersonic jets, will cut carbon emissions and noise across the aviation sector to align with climate goals through tighter design norms and certification rules.With formal adoption now complete, ICAO said the revised framework will push manufacturers to integrate advanced, cleaner technologies into aircraft design, while ensuring uniform compliance through updated testing and certification procedures.“New standards will ensure that the latest technological advancements are embedded in aircraft design, supporting sustainability while fostering innovation,” ICAO said.The CO2 emissions standard has been made 10 per cent more stringent and will apply to new aircraft type designs from 2031. In addition, a more complex emissions requirement has been introduced for in-production aircraft, which will take effect for new deliveries from 2035, widening the regulatory net beyond future models.On noise, ICAO has tightened limits by six decibels for large aircraft and two decibels for smaller ones. These norms will apply to new aircraft designs from 2029, marking a significant escalation in global noise control standards.According to ICAO, the updated subsonic rules are expected to drive investment in fuel efficiency and quieter aircraft technologies, with direct benefits for passengers, airport communities and the environment.The Council has also moved to prepare for the return of supersonic aviation. From 2029, such aircraft will be required to meet the same noise limits as current subsonic aircraft, addressing concerns over sonic boom and operational noise.“These measures reflect the complex realities of introducing new technologies while ensuring environmental integrity,” ICAO said, adding that the revised standards are backed by updated certification procedures to ensure consistent measurement of emissions and noise.The standards have been developed over several years through ICAO’s Committee on Aviation Environmental Protection, involving technical analysis, consultations with member states and industry stakeholders, and assessment of emerging aircraft and engine technologies.