An apparatus, method, and computer program for process control using people and asset tracking information are provided. One or more process control data elements are received, which define a location associated with a person and/or an asset in a processing environment. At least part of the processing environment is controlled using the one or more process control data elements. For example, the processing environment could be controlled based on whether a specified area has been evacuated or whether one or more specified personnel or types of personnel are present in the specified area. The location can also be used to prevent the person and/or the asset from entering a restricted part of the processing environment, identify any people failing to reach specified zones of the processing environment during an incident, and identify a current actual or estimated location of at least one person to be rescued in the processing environment.