The correct answer is option 2, scrutiny by government agencies. Environmental auditing is a process that assesses the environmental impact and compliance of an organization or industry. It involves evaluating various aspects such as pollution levels, waste management, resource consumption, and adherence to environmental regulations.

Option 1, pollution monitoring schemes, is included in environmental auditing as it is important to monitor and measure pollution levels to identify areas of concern and take appropriate action.

Option 3, safety provisions for industrial workers, is also included in environmental auditing as it is crucial to ensure the safety and well-being of workers who may be exposed to hazardous substances or processes.

Option 4, storage of toxic chemicals, is also included in environmental auditing as proper storage and handling of toxic chemicals is necessary to prevent environmental contamination and health risks.

However, option 2, scrutiny by government agencies, is not a part of environmental auditing. While government agencies may conduct inspections and audits of organizations, this is not considered a component of environmental auditing itself. Alert - correct answer should be None.