Air protection

At CERN, emissions into the atmosphere result from accelerator operation (e.g. ventilation from tunnels, experimental activities) and industrial activities (e.g. workshops) carried out on the various sites, and life on sites (e.g. heating plant, transport, commuting). Atmospheric emissions are monitored to guarantee that CERN activities comply with the applicable regulations in force in the Host States.

Some of the water used in cooling circuits evaporates into cooling towers and results in water vapour releases. Water in cooling towers is checked regularly and treated in accordance with the Host States' regulations so as to limit any bacterial issues.

Heating plant – Meyrin

SPS and LHC cooling towers

Building 198 - ISOLDE

Greenhouse gas emissions at CERN arise from the operation of the Laboratory’s research facilities. The majority of emissions come from CERN’s core experiments and more than 78% are fluorinated gases. With climate change a growing concern, the Organization is committed to reducing its direct greenhouse gas emissions.

CERN has a formal objective to reduce its scope 1 emissions by 28% by the end of 2024. To achieve this objective, in addition to the ongoing efforts (repairs, upgrades, F-gas recirculation systems, etc.), CERN will replace F-gases in detector cooling systems with CO2, which has a significantly lower global warming potential. For further details please see the CERN Environment Report.

Scope 1 and Scope 2 emissions 2017-2018

CERN SCOPE 1 AND SCOPE 2 EMISSIONS FOR 2017 AND 2018 BY CATEGORY. Other includes air conditioning, electrical insulation, emergency generators and CERN vehicle fleet fuel consumption.