The Fourth Periodic Report on the State of Acid Deposition in East Asia Part II: National Assessment

The "Fourth Periodic Report on the State of Acid Deposition in East Asia “ Part II: National Assessment" presents an in-depth evaluation of acid deposition and air pollution across thirteen East Asian countries, including Cambodia, China, Indonesia, Japan, Lao PDR, Malaysia, Mongolia, Myanmar, Philippines, Republic of Korea, Russia, Thailand, and Vietnam. This assessment, based on monitoring data from 2015 to 2019, provides an extensive review of acid deposition trends, air pollution levels, and the effectiveness of national mitigation measures. Key findings highlight the variability in acid deposition levels across the region, with urban areas showing higher concentrations of sulfuric and nitric acids due to industrial activities and vehicular emissions. The report also identifies long-term trends using data spanning two decades (2000–2019) to assess the environmental impact of acid deposition. Furthermore, the document evaluates national monitoring activities, quality assurance protocols, and policy measures implemented to mitigate acid deposition effects. The report underscores the importance of continued long-term monitoring and regional collaboration to address transboundary air pollution. It calls for improved emission control policies, public awareness initiatives, and enhanced scientific cooperation to ensure sustainable air quality management in East Asia. The findings serve as a critical resource for policymakers and environmental researchers working toward effective air pollution control strategies.