Climate Change Countermeasures

Independent assurance of environmental performance data

Environmental performance data is subject to third-party assurance to ensure its reliability. The data indicated with a third-party assurance mark for the year of 2025 have been independently assured by KPMG AZSA Sustainability Co., Ltd.

Independent Practitioner’s Limited Assurance Report [PDF 175KB]

*1 GHG: Greenhouse Gas

Scope 1, Scope 2, and Scope 3 emissions were 49,175 tCO₂e, 1,167 tCO₂e, and 1,103,831 tCO₂e, respectively. Scope 1 emissions are CO₂ emitted directly by the Group. These include CO₂ emissions associated with the use of gasoline, diesel, fuel oil, city gas, and LPG, and emissions of chlorofluorocarbons and carbon dioxide gas, etc. Scope 2 emissions are indirect CO₂ emissions associated with the use of energy supplied by others (such as electricity). We have promoted the conversion to sustainable electricity, resulting in zero Scope 2 emissions domestically from 2023. Scope 3 emissions are all other indirect CO₂ emissions from activities of the organization other than Scope 1 and 2. In 2025, Category 1 (Purchased goods and services) accounted for 82% of Scope 3.

Note that the emission factors used in calculating energy and CO₂ emissions and the calculated boundary of each scope and category are listed in Sustainability Data 2025.

Manufacturing plants are the function with the highest emissions at 34,412 tCO₂e, followed by research laboratories at 12,350 tCO₂e, branch offices at 1,638 tCO₂e and the head office at 17 tCO₂e. Total emissions from overseas research, production and sales sites were 1,470 tCO₂e.

The energy type with the largest volume of emissions is city gas at 46,695 tCO₂e, followed by gasoline at 1,706 tCO₂e, heat at 1,167 tCO₂e, diesel at 248 tCO₂e, fuel oil at 39 tCO₂e, and LPG at 32 tCO₂e. All purchased electricity has been transitioned to sustainable power, achieving zero CO₂ emissions from electricity consumption.

Scope 1 and Scope 2 emissions from energy consumption decreased by 55.8% from the base year level to 49,887 tCO₂e. Regarding Scope 2 emissions, in 2021, plants and research laboratories that consume a lot of electricity started to switch to sustainable electricity provided by electric power companies, and by utilizing Non-Fossil Fuel Certificates at our head office and branches, we achieved 100% sustainable electricity use across the entire Group in Japan in 2023. Overseas sites are also promoting the use of sustainable electricity, and in 2025 the Chugai Group as a whole achieved a sustainable electricity ratio of 100% as stated in its Mid-term Environmental Target 2030. In addition, through these initiatives, we achieved the 2025 target for energy-related CO₂ emissions (40% reduction compared to 2019) under the Mid-term Environmental Target 2030. In order to achieve the 2030 target (60–75% reduction compared to 2019), we also need to reduce direct CO₂ emissions from fuel use (Scope 1), so we are considering conversion of existing facilities as well as facility consolidation and redesign.
To address the global social issue of climate change, we will look further ahead and actively contribute to solving social issues by setting and implementing a long-term goal of zero CO₂ emissions by 2050.

For more information on the Mid-term Environmental Target 2030, please click here.

* There was an error in the calculation of Category 5 (waste) under “Others,” and the figures for “Others” from 2023 to 2024 have been corrected accordingly.

Scope 3 emissions were 1,103,831 tCO₂e, a 14.1% increase from the base year. In Category 1 (Purchased goods and services), emissions increased by 32.8% compared to the previous year due to an increase in the amount of goods and services purchased. In addition, the increase in Category 2 (Capital goods) in 2024 was due to the construction of new buildings at the Ukima and Fujieda sites. We believe that it is important to take action to reduce CO₂ emissions throughout the supply chain in order to realize a sustainable society. To this end, we have set a CO₂ emissions reduction target of 30% by 2030, and we will encourage suppliers who have not set CO₂ emission reduction targets to set and promote them.

Furthermore, as a member of the Japan Pharmaceutical Manufacturers Association, we participated in the Ministry of the Environment’s “Decarbonization Promotion Model Project across the Value Chain (Industry Associations)” and contributed to the development of the “Guidelines for Scope 3 Calculation and Collaboration with Business Partners in the Pharmaceutical Industry.” These guidelines outline common industry rules for Scope 3 calculation, approaches to primary data collection, and methods for engagement with business partners, and we will continue to contribute to reducing value chain emissions across the industry.

Energy consumption in 2025 was 2,288 TJ, and energy consumption per total floor area was 6.0 GJ/m², a 16.1% decrease from the base year and a 4.3% decrease from the previous year.

As a result, we achieved the 2025 target for energy consumption under the Mid-term Environmental Target 2030 (a 5% reduction per total floor area compared to 2019). In 2025, the use of fossil fuels (such as city gas) decreased by 3.8% from the previous year, while electricity consumption increased by 3.9%. A large portion of our energy use is attributable to air conditioning at research and manufacturing sites, and in 2025, increased air conditioning load due to higher temperatures was one of the factors contributing to the increase in electricity consumption.

In order to achieve the 2030 target (a 15% reduction per total floor area compared to 2019) , we will continue to promote efforts to reduce energy consumption through several actions such as introducing high energy efficiency equipment, fuel conversion, introduction of eco-cars, and energy-saving campaigns in our business activities.

In 2025, the amount of fluorocarbon held was 32,804 kg, a decrease of 4,223 kg from 2024, and we achieved the 2025 target for fluorocarbon holdings under the Mid-term Environmental Target 2030 (a 25% reduction compared to 2020). In order to achieve a 100% reduction in usage of fluorocarbons by 2030, we are promoting initiatives with specific action plans, such as verification of alternative technologies, and installation of natural refrigerants when constructing new buildings or renewing equipment. In 2024, the Ukima Site commenced operation of UK4, a biopharmaceutical manufacturing building that is completely free of chlorofluorocarbons (CFCs).

At Chugai Life Science Park Yokohama, the Welfare Building (Nijikake Nursery School) was the first in the Chugai Group to install a room air conditioning system that uses CO₂ refrigerant, a natural refrigerant, after repeated discussions with an air conditioning equipment company. In addition, in the research building, we have, with the cooperation of manufacturers, introduced centrifuges and ice machines that use natural refrigerants. Going forward, we will continue to upgrade to equipment that uses new refrigerants (green refrigerants), actively promote technological developments with construction companies and equipment/device manufacturers, promote conversion to new refrigerants (green refrigerants) with low greenhouse effect, and work on climate change countermeasures.

Moreover, as a measure against leakage due to aging equipment and other factors, we have been working to upgrade our equipment starting in 2022. As a result, the amount of fluorocarbons used to refill equipment in 2025 (amount of fluorocarbons leakage) was reduced to 246 tCO₂e. We will continue to optimize our voluntary management by gaining an understanding of the amount of fluorocarbons leaked.

Please see the following page for details on the use of CO₂ refrigerant in room air conditioning.
Activity Report: “Adoption of a Natural Refrigerant Air Conditioning System in the Welfare Building at Chugai Life Science Park Yokohama (Toward 100% Reduction of Fluorocarbon Usage by 2030 under the Mid-term Environmental Target)” (November 15, 2022)

At the end of 2025, the introduction rate of eco-friendly cars for commercial vehicles was 92%, and the total fuel consumption was 23,730 GJ, a decrease of 43.7% compared to the base year. As a result, we achieved the 2025 target for total fuel consumption of commercial vehicles under the Mid-term Environmental Goals 2030 (a 35% reduction compared to 2019). The Group will further strengthen its efforts to introduce eco-friendly vehicles such as hybrid cars and highly fuel-efficient vehicles, and will consider the introduction of electric vehicles and other measures to achieve the 2030 target of a 75% reduction.

• TCFD^*1 Disclosure Based on Proposals: Analysis as of 2023
• SBT^*2 Certified in November 2021
• CDP^*3 Climate Change A-List Selection (as of 2025)

• *1 TCFD: Disclosure of climate-related information that has a financial impact on the company
• *2 SBT (Science Based Targets): Greenhouse gas emission reduction targets set by companies for the next five to 15 years, consistent with the levels required by the Paris Agreement
• *3 CDP: An international non-governmental organization (NGO) established in the United Kingdom to promote the disclosure of environmental information