As low as reasonably achievable, ALARA, is a principle of optimising radiation protection. It is the process of keeping the magnitude of individual doses and the number of people exposed as low as reasonably achievable, below the appropriate dose limits, while taking economic and social factors into account.


The Accelerator Research and Innovation for European Science and Society, ARIES, is an Integrating Activity project which aims to develop European particle accelerator infrastructures, co-funded under the European Commission's Horizon 2020 Research and Innovation programme.


Autorité de sûreté nuclaire, ASN, is the French Nuclear Authority responsible for the oversight of nuclear safety and radiation protection in order to protect people and the environment.


CERN Environmental Protection Steering Board, CEPS, was established in 2017. CEPS's mandate is to identify and prioritise environmental areas to be addressed, propose programmes of action, and follow-up their implementation following endorsement by the Enlarged Directorate.

CERN safety policy

The CERN Safety policy is the Organization’s reference document for all matters relating to health, safety and environmental protection. The policy includes the explicit goal of limiting the impact of the Organization’s activities on the environment.


Comité Tripartite sur l'environnement, CTE, is a tripartite committee with CERN, the environmental authorities of the Canton of Geneva, Switzerland, and the Sub-Prefectures of Gex and Nantua, France, regarding non-radiological environmental aspects.


CERN's Energy management panel, EMP, examines CERN’s energy consumption and identifies measures to improve efficiency organisation-wide and promote energy reuse.

Energy for sustainable science

Energy for sustainable science is a biennial workshop series that seek to establish a culture of energy and environmental awareness across the research infrastructure community. The series was co-funded by CERN in 2011.


The Global Reporting Initiative, GRI, is an international independent organisation helping private and public bodies understand and communicate their impact through the development of a sustainability reporting framework and set of guidelines.


Global Warming Potential, GWP, is a value describing the radiative forcing impact of one unit of a given greenhouse gas, relative to one unit of CO2 over a given period of time. The GWP values convert greenhouse gas emissions data for non-CO2 gases into units of CO2 equivalent.

High-Luminosity LHC

The High Luminosity LHC, HL-LHC, is an upgrade of the LHC to achieve instantaneous luminosities a factor of five larger than the LHC nominal value, thereby enabling the experiments to enlarge their data sample by one order of magnitude compared with the LHC baseline programme.

HSE Unit

The Occupational Health, Safety and Environmental Protection Unit, responsible for all matters regarding health, safety and environmental protection at CERN.


Instrumentation for Environmental Monitoring and Impact Assessment, INEMIA, was a project that aimed to strengthen, upgrade, and extend CERN's network of measuring instruments used for environmental monitoring.


The International Union for Conservation of Nature, IUCN, is the global authority on the status of the natural world and the measures needed to safeguard it.


The Knowledge Transfer group, KT, at CERN aims to engage with experts in science, technology and industry in order to create opportunities for the transfer of CERN’s technology and know-how. The ultimate goal is to accelerate innovation and maximise the global positive impact of CERN on society.


The Large Hadron Collider, LHC, is the world’s largest and most powerful particle accelerator. It first started up on 10 September 2008 and consists of a 27-kilometre ring of superconducting magnets with a number of accelerating structures to boost the energy of the particles along the way.


Materiality is a term used in sustainability reporting. In this report, material topics are those reflecting the environmental impact of CERN and/or those influencing internal and external stakeholders.

Nature & Economie Foundation

The Fondation Nature & Economie is a Swiss foundation that promotes work, living and study environments that are close to nature, and awards a quality label to exemplary sites. CERN has been rewarded with the label since 2009 for its efforts to protect biodiversity.


Office fédéral de la santé publique, OFSP, is the Swiss Federal Office for Publish Health. The authority is responsible for responsible for public health in Switzerland, including matters of radiation protection.


Office National des Forêts, ONF, is France's National Forestry Office.


Prevention of Pollution by Liquid Chemical Agents, PoLiChem, was a project with the purpose to update and consolidate the inventory of the quantities and types of liquid chemical agents present on CERN sites, with risk assessments and risk severity scores.


Plan régional d'evacuation des eaux, PREE, is a regional water evacuation plan in the Canton of Geneva. This report refers specifically to the PREE for the Nant d'Avril, a watercourse near CERN, and includes a plan with 14 actions to be undertaken.

Rio Declaration on Environment and Development

The Rio Declaration on Environment and Development consists of 27 principles inteded to guide countries in future sustainable development. It was produced in 1992 at the United Nations Conference on Environment and Development, UNCED, and signed by over 175 countries.

Science Gateway

Science Gateway will be an education and outreach facility next to the Globe of Science and Innovation. It will be a beacon to encourage young people to aim for careers in science, technology, engineering and mathematics, STEM.

Scope 1 greenhouse gas emissions

Scope 1 is the direct greenhouse gas emissions, i.e. emissions from sources that are owned or controlled by an organisation.

Scope 2 greenhouse gas emissions

Scope 2 is the energy indirect greenhouse gas emissions, i.e. emissions that result from the generation of purchased or acquired electricity, heating, cooling, and steam consumed by an organisation.


The United Nations Sustainable Development Goals address the global challenges the world is facing, including those related to poverty, inequality, climate change, environmental degradation, peace and justice.


The Super Proton Synchrotron, SPS, is the second-largest machine in CERN’s accelerator complex and it provides beams for experiments at CERN, as well as preparing beams for the LHC.

Tripartite agreement on radiation protection and radiation safety

A tripartite agreement between CERN, the Swiss Federal Office for Public Health, OFSP, and the French Nuclear Authority, ASN. The agreement has established a framework for the discussion of topics related to radiation protection, specifically protecting CERN workers and people from ionising radiation whether on-site or in the vicinity of CERN’s facilities.


The World-wide LHC Computing Grid, WLCG, is the data-storage and analysis infrastructure built and maintained for the entire high-energy physics community using the LHC.

Learn more

Questions regarding this report may be addressed to Environment.report@cern.ch.

Main page of the Environment Report 2017-2018
Explore CERN and the Environment (Leaving the report site)
News and updates about Environmental Protection (Leaving the report site)