In 2025, Aon completed a corporate carbon footprint assessment and publicly disclosed its greenhouse gas (GHG) emissions according to the GHG Protocol, covering Scope 1 (direct emissions from owned or controlled sources) and Scope 2 (indirect emissions from purchased energy).
However, Aon has not published a category-level breakdown of its Scope 3 emissions, limiting visibility into specific value chain sources.
| Metric (tCO2e) | 2025 | 2024 | 2023 | 2022-2019 |
|---|---|---|---|---|
Total Scope 1 | 20,189a | 15,235b | 16,790b | |
Total Scope 2 | ||||
Market-Based | 23,285a | N/A | N/A | |
Location-Based | 24,488a | N/A | N/A | |
Unspecified Calculation Method | N/A | 31,787b | 32,188b | |
Total Scope 3 | N/A | 416,183b | 450,060b | |
Total Scope 1 Revenue Intensity (tCO2e/$M) | 1.1751a | 0.9705b | 1.2552b |
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In 2025, the total operational greenhouse gas (GHG) emissions of Aon amounted to 44,677 metric tons of CO2 equivalent. This figure includes both direct emissions from owned or controlled sources (Scope 1) and indirect emissions from purchased energy (Scope 2).a
Compared to 2024, the total operational greenhouse gas (GHG) emissions of Aon decreased by 4.99%, showing that the company has made progress in taking action to reduce the climate impact of its operations.ab
In 2025, the total Scope 1 emissions of Aon were 20,189 metric tons of CO₂ equivalent (tCO₂e).a
Since 2019, Aon's Scope 1 emissions have increased by 43.59%, reflecting a rising long-term trend in Scope 1 emissions over time.ac
Compared to the previous year (2024), Aon's Scope 1 emissions increased by 32.52%, suggesting that the company faced challenges in reducing emissions from its directly owned or controlled operations.ab
In 2025, Aon reported Scope 2 greenhouse gas (GHG) emissions of 23,285 tCO₂e using the market-based method and 24,488 tCO₂e using the location-based method.a
In 2025, Aon reported its Scope 2 emissions using the market-based method and using the location-based method.a
In 2025, Aon reported Scope 1 greenhouse gas (GHG) emissions of 20,189 tCO₂e and total revenues of USD 17,181 millions. This translates into an emissions intensity of 1.18 tCO₂e per millions USD.a
In 2025, Aon reported a Scope 1 emissions intensity of 1.18 tCO₂e per millions USD. Compared to the peer group median of 0.83, this places the company above its industry benchmark, indicating it is less carbon-efficient than most competitors.a
In 2025, Aon ranked 18 out of 24 companies in its industry peer group, based on Scope 1 emissions intensity (measured in tCO₂e per millions USD).a
Aon is therefore positioned in the mid-range of its industry, neither a clear leader nor a laggard in carbon efficiency.a