Resistive Plate Chambers and Gaseous Detector Activities in the Brazilian High Energy Physics Community

This document presents an overview of the activities of Brazilian groups on gaseous detectors, with emphasis on resistive plate chambers (RPCs) for the CMS experiment at the CERN LHC and related applications. It summarises the design, performance, maintenance and upgrade of the CMS RPC system, including the installation of improved RPCs for the HL-LHC era and the development of alternative, lower-GWP gas mixtures. It also describes local laboratory infrastructures in Brazil for RPC assembly, testing and gas studies, as well as spin-off projects such as the MARTA cosmic-ray detector and applications in medical imaging and muography. It is intended as a living reference to be periodically updated, documenting the contributions of the Brazilian community to RPC technology and its applications.