Strategies for reducing the environmental impact of gaseous detector operation at the CERN-LHC experiments

Over the five experiments (ALICE, ATLAS, CMS, LHCb and TOTEM) taking data at the CERN Large Hadron Collider (LHC) more than 28 gas systems are delivering the proper gas mixture to the corresponding detectors. In some cases the use of expensive and/or greenhouse gases cannot be avoided because of physics requirements that impose certain choice on the gas mixture. Typical example is the use of Freon like R134a, CF4 and SF6. The present contribution describes the current status with the new strategies applied to the LHC gas system in order to reduce operational cost and greenhouse gases emission.