Which regulation is applicable to air quality controls in Hong Kong?

The Hong Kong Air Pollution Regulation is directly applicable to air quality controls in Hong Kong, as it serves as the primary legal framework set forth by the local government to manage air pollution. This regulation outlines the standards and legal requirements for emissions, monitoring, and management of air quality within the region, thereby ensuring public health and environmental sustainability.

In contrast, the South Coast Air Quality Management Rule 1113 pertains specifically to air quality issues in a designated area of California, making it irrelevant to Hong Kong's regulatory context. The European Decopaint Directive focuses on limiting VOC emissions from decorative paints and related products within the European Union, thereby not applying to air quality regulations in Hong Kong. ISO 17025 sets out the requirements for testing and calibration laboratories but does not serve as a regulatory framework for air quality control or environmental policy in any specific region, including Hong Kong. Thus, the Hong Kong Air Pollution Regulation is the most applicable and relevant choice.