<h2>Many active mitigation systems include a warning https://yorkradonhelp.com/[size= 14px] or pressure indicator that provides information about system operation. However, the indicator alone does not measure the actual indoor radon concentration. Follow-up radon testing remains important because it provides direct information about the level of radon inside the building. If levels remain elevated, the system should be evaluated by a qualified professional.[/size]</h2>