Environmental noise
Like other industrial plants, the infrastructure needed to operate CERN’s large accelerators emits noise.
CERN has implemented an environmental Noise footprint reduction policy and implementation strategy to ensure that noise levels do not exceed a defined baseline, established in 2018. Since then, annual noise monitoring campaigns have been carried out at around 120 locations, during both daytime and night-time, to confirm continued compliance with the established limits
Noise from CERN sites is characterised using a combination of noise source assessments and acoustic modelling techniques. The on-site acoustic measurements are processed using 3D geo-referenced noise modelling software, which calculates CERN’s environmental noise footprint in relation to the nearest residential areas. Based on the results of this modelling, appropriate mitigation measures are identified and implemented where necessary.
Priority is given to reducing noise at its source, for example by modifying installations or replacing noisy equipment with quieter alternatives. In addition, continuous (24/7) noise monitoring is carried out at sensitive locations to detect unusually high noise levels and to identify any malfunctioning equipment at an early stage.
Finally, CERN maintains regular communication with local authorities to help ensure that future residential developments take into account the proximity of existing technical infrastructure, building on lessons learned from past planning decisions.
Documentation:
CERN Environment report 2021-2022: Noise chapter
Memorandum - CERN's noise emissions to the environment