What are some possible sources of complaints about environmental compliance?

The correct answer encompasses all the provided sources, indicating a broad understanding of how environmental compliance complaints can arise. Company informants can be employees or insiders who observe compliance violations and feel compelled to report them, often motivated by safety concerns or ethical considerations.

Neighborhood reports of odors are significant because they reflect community engagement and awareness about local environmental issues. Residents may notice unpleasant or hazardous smells emanating from a facility, triggering concern about the potential for harmful emissions or pollutants.

Referrals from another agency highlight the interconnected nature of environmental oversight. Agencies collaborating or sharing information can lead to the identification of compliance issues that one entity might not have encountered independently.

Together, these sources create a comprehensive picture of how environmental issues can be reported and addressed, emphasizing the importance of vigilance and communication from various stakeholders in ensuring compliance with environmental standards.