This report is the National Assessment, Part II of Fourth Periodic Report on the State of Acid Deposition in East Asia (PRSAD4). The National Assessment of PRSAD4 was prepared by each participating country according to the format for national assessment that prepared by the Drafting Committee of the PRSAD4. At present, thirteen countries, namely Cambodia, China, Indonesia, Japan, Lao PDR, Malaysia, Mongolia, Myanmar, Philippines, Republic of Korea, Russia, Thailand, and Vietnam have participated in the EANET. Those countries have shared the progress of their national monitoring activities, including state of acid deposition and air pollution in their respective country and the national measures implemented.