The EANET 20th Anniversary celebration and the EANET Science and Policy Dialogue were organised back-to-back on 26 November 2021. The virtual event gathered over one hundred participants from 30 countries to discuss better air quality for all. The EANET’s 20th Anniversary celebration was organised to commemorate the significant milestones of the Acid Deposition Monitoring Network in East Asia (EANET) in its twenty years of successful inter-regional cooperation and implementation of activities. The EANET was established in 2001 as a regional intergovernmental network to promote cooperation among thirteen Participating Countries, including Cambodia, China, Indonesia, Japan, Lao PDR, Malaysia, Mongolia, Myanmar, Philippines, Republic of Korea, Russia, Thailand and Vietnam, to address acid deposition problems. Accumulating the progress of the EANET in the last 20 years, a new publication, 'Summary of The Twentieth Anniversary of The Acid Deposition Monitoring Network in East Asia (EANET),'' had been developed and was launched during the event. Hosted by the Ministry of the Environment, Japan, the celebration was highlighted with the congratulatory remarks of the EANET national focal points and the presentation of the Summary of the Twentieth Anniversary of the EANET. More details of the 20th anniversary.