The International Civil Aviation Organization (ICAO) Council has approved stronger global environmental standards for aircraft, with the package taking effect on August 3, 2026 and scheduled for worldwide implementation from January 1, 2027. The new rules require manufacturers to reduce carbon emissions and cut noise through stricter design limits and updated certification procedures, and they explicitly cover next‑generation supersonic designs as well as subsonic types.
Under the revised framework, aircraft makers must incorporate cleaner, more efficient technologies into new designs and meet uniform compliance tests and certification methods. ICAO said the changes will embed recent technological advances in aircraft design, supporting sustainability while encouraging continued innovation.
Major elements of the update include a 10% tightening of the CO2 emissions standard, which will apply to new aircraft type designs from 2031. A more detailed emissions requirement will also apply to aircraft already in production, coming into force for new deliveries from 2035—expanding regulatory reach beyond future models.
Noise standards are also more stringent: limits are lowered by six decibels for larger aircraft and by two decibels for smaller types. Those noise limits will apply to new aircraft designs beginning in 2029. ICAO has likewise prepared for a return of commercial supersonic operations by requiring from 2029 that such aircraft meet the same noise limits as current subsonic airplanes, addressing concerns about sonic booms and operational noise.
ICAO expects the updated subsonic rules to spur investment in fuel‑efficient and quieter technologies, delivering benefits to passengers, airport communities and the broader environment. The standards were developed over several years by ICAO’s Committee on Aviation Environmental Protection through technical analysis, consultations with member states and industry stakeholders, and assessments of emerging aircraft and engine technologies.
