Dikgale, Moyahabo S2026-09-252026-09-252026-09http://hdl.handle.net/10204/14954Accurate measurement of emissions from industrial stacks is critical for effective clean air management and compliance with regulatory standards. Instruments used to measure gas velocity and sample pollutants, including Pitot tubes and Cegrit samplers, provide dependable results only when supported by thorough calibration. This paper outlines calibration practices conducted using wind tunnel facilities at the Council for Scientific and Industrial Research (CSIR), which provide traceable reference conditions across diverse operational ranges. By documenting calibration protocols, correction factors, and uncertainty budgets, the study demonstrates how technical accuracy enhances the reliability of emission data. Case studies show that calibrated instruments improve dispersion assessments, facilitate compliance with South Africa’s National Air Quality Act, and furnish industries with credible evidence for cleaner operations. The results highlight that calibration extends beyond being a technical necessity; it is a critical bridge between measurement integrity, regulatory enforcement and the broader mission of sustainable air quality management.FulltextenCalibrationComplianceIndustrial emissionsUncertainty analysisAir quality managementConference Presentationn/a