A worker submitted a workers’ comp claim, stating that she suffered headaches as a result of exposure to hydrogen sulphide (H2S) gas. Part of her duties required her to bump and calibrate six H2S monitors. Her claim was denied, so she appealed. The Appeals Commission denied her appeal. Some level of H2S would have been released into the air as a result of calibrating or bump testing. But there was no compelling evidence that the gas was present in levels sufficient to contribute to the worker’s headaches. In addition, an OHS officer found no violations of the OHS laws, noted the Commission [2015-0859(Re),  CanLII 19767 (AB WCAC), April 14, 2016].