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Measure the carbon emissions from a flight, aircraft or seat with unmatched accuracy.

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    Flight Emissions Review

    Accurate emissions data is a game changer for sustainable aviation. The Flight Emissions Review offers vital insights for airlines, airports, and industry leaders.

    • Global Category Rankings showing the top 20 Major airlines and the Worlds 10 largest airlines by CO2 per Available Seat Kilometer.
    • Regional Performance breakdowns showing which airlines excel on intra-region and inter-region routes.
    • Route-Level Improvements identifying specific airport pairs with the greatest efficiency gains.
    • Operational Insights revealing how fleet composition, load factors, and route optimization drive performance differences.

    Download the full report and explore how EmeraldSky provides unmatched accuracy in emissions intelligence.

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    Flight Emissions Digest

    Download the latest insights from Cirium’s flight emissions experts. Published monthly, these digests provide deeper insights into the aviation industry’s commitment to reducing CO2 emissions in an easy-to-read format.

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    From the leader in aviation data, discover a unique and unparalleled methodology, data, and analytics.

    EmeraldSky aircraft and flight emissions methodology and data support the aviation industry with the most accurate historic and forecasted emissions data in air travel and transport.

    Airlines

    Measure emissions for your fleet, aircraft, and flights; plan for efficient aircraft and upgrades, and demonstrate your commitment to Net Zero goals.

    SEE THE DATA IN ACTION

    Corporate Travel

    Build sustainable travel programs, ensure regulatory compliance, and improve ESG reporting for investors and stakeholders.

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    Aviation Finance

    Benchmark flight emissions across owned and leased aircraft, enhance environmental disclosures, and identify new ways to cut aircraft emissions.

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    Airports

    Improve reporting for regulatory compliance and optimize fees and incentives for fuel-efficient aircraft.

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    What can we solve for you?

    Let us demonstrate the power of Cirium emissions data and analytics.

    LET’S EXPLORE SOLUTIONS

    Curious about what makes the industry’s best emissions data and calculations stand out? We’ve created these detailed overview documents to guide you.

    EMISSIONS DATA OVERVIEW:

    A one-page guide to the data points considered in Cirium emissions calculations.

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    EMERALDSKY METHODOLOGY:

    See our unique data-driven approach to emissions calculations.

    DOWNLOAD INFOGRAPHIC

    EMERALDSKY COMPARISON:

    Take a look at how we stack up to other solutions in the market.

    DOWNLOAD CHARTS

    EMISSIONS DATA OVERVIEW:

    A one-page guide to the data points considered in Cirium emissions calculations.

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    EMERALDSKY METHODOLOGY:

    See our unique data-driven approach to emissions calculations.

    DOWNLOAD INFOGRAPHIC

    EMERALDSKY COMPARISON:

    Take a look at how we stack up to other solutions in the market.

    DOWNLOAD COMPARISON CHARTS

    Independently verified with unmatched accuracy of over 99% in measuring aircraft and flight emissions.

    Organizations around the world recognize the precision and accuracy of Cirium’s flight emissions data and analytics to make informed decisions.

    • EY
    • Route Zero
    • Trees4Travel
    • RMI
    • RELX
    • American Airlines
    • Virgin Atlantic
    • Impact on Sustainable Aviation

    “Accurate measuring, monitoring, and forecasting of CO2 emissions is critical as we target and monitor progress to Net Zero 2050, allowing us to better understand our environmental impact. Cirium is leading the way in this field, building data and forecasting capabilities that are the most accurate we have seen to date, as verified against our own historical fuel burn and emissions data.”

    – Virgin Atlantic

    Move forward confidently with an experienced, trusted, and reliable data partner.

    With decades of deep industry knowledge and unparalleled experience, Cirium takes a consultative approach to sustainability. We provide unbiased insights into operations. We help identify opportunities, recommend solutions, and help implement them across your organization.

    Our data experts are here to show you how powerful Cirium data and analytics can be.

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    Download the detailed methodology used to calculate aircraft and flight emissions.

    EMERALDSKY EMISSIONS METHODOLOGY DOCUMENTATION 2025

    EMERALDSKY METHODOLOGY OVERVIEW

    THOUGHT CLOUD

    EXPLORE THE CIRIUM BLOG