What is meant by a 'fugitive source' of emissions?

A 'fugitive source' of emissions refers to an uncontrolled source that releases pollutants into the environment without being managed or contained by specific equipment or controls. This type of emission can occur through various mechanisms, such as leaks from pressurized tanks, spills, or during normal operations where materials might escape unintentionally into the air.

The reason option B is correct lies in its definition of fugitive emissions as not being under regulatory management or control, which contrasts with other sources that are monitored and mitigated through technologies and regulations. This distinction is critical in environments dealing with hazardous substances like asbestos, where the goal is often to minimize any uncontrolled release into the atmosphere to protect public health and safety.

The other options describe different types of sources or conditions that do not fit the definition of a 'fugitive source.' Controlled sources managed by regulations would be actively monitored and maintained to prevent emissions. A source flagged for remediation implies that it is recognized for necessary corrective action, rather than being uncontrolled. Lastly, a source with low emissions due to newer technology suggests an effective emission control strategy rather than an uncontrolled release. Thus, B accurately captures the essence of what constitutes a fugitive source of emissions.