Respirable and Silica dust control is a complex science. Engineering controls for respirable and Silica dust mitigation are the most frequently utilised method for minimising risk of exposure to workers. However, the efficiency of the installed control is never measured to quantify if the control is actually working. Exposure level monitoring is for personal sampling only and does not identify the risk potential of lung disease to the worker. Simply being in compliance does not protect a worker from lung disease. Removing the hazard to as low as reasonably achievable significantly lowers the risk of lung disease. Installed engineering controls MUST be tested to quantify how much hazardous dust they actually remove. Otherwise, why have them?