Quality Assurance Level 3, commonly known as QAL3, is a component of the quality assurance framework for continuous emissions monitoring systems (CEMS) used in air quality monitoring. This framework is established to ensure the accuracy, reliability, and ongoing performance of the monitoring instruments, particularly those used to measure emissions from industrial sources.

QAL3 activities are typically conducted less frequently than QAL2 activities but are still essential for ensuring the long-term reliability and accuracy of the monitoring system. These activities contribute to the overall quality assurance of emissions data and are crucial for regulatory compliance and environmental protection.

It’s important to note that adherence to QAL procedures is often a regulatory requirement, and compliance with these standards helps ensure that the emissions data provided by CEMS is trustworthy and can be used for regulatory decision-making and environmental management.