Publications·December 30, 2021
This Executive Summary of the Fourth Periodic Report on the State of Acid Deposition in East Asia (PRSAD4) provides a comprehensive assessment of acid deposition trends, air pollution, and their environmental impacts in the region based on 20 years of monitoring data (2000-2019) from the Acid Deposition Monitoring Network in East Asia (EANET). The summary highlights the progress of regional cooperation in monitoring acid deposition and air pollution, emphasizing the importance of standardized data collection and quality assurance protocols. Key findings indicate a significant decline in sulfur dioxide (SO2) concentrations in Northeast Asia, particularly in China, Japan, and the Republic of Korea, due to stringent emission control measures. However, some areas in Southeast Asia have shown increasing acid deposition trends. The summary also evaluates the ecological impacts on soil, vegetation, and aquatic environments, stressing the need for continued monitoring and research to mitigate long-term environmental and health risks. Recommendations include enhancing regional collaboration, improving emission inventories, and integrating satellite data and modeling studies to refine acid deposition assessments. This Executive Summary serves as a valuable resource for policymakers and researchers in formulating effective air quality management strategies in East Asia.