Dear Colleagues On behalf of the conference advisory board, I am pleased to inform you that the ACID RAIN 2020 conference will be held in Niigata, Japan, from Monday 17 to Friday 21 April, 2023. The registration will open on 1 May 2022. Please visit https://www.acidrain2020.org for more details Thank you for your interest, best regards Elena Paoletti -- *Institute of Research on Terrestrial Ecosystems (IRET)* *National Research Council* * (CNR) * Via Madonna del Piano 10, Sesto Fiorentino (Florence) Italy *Tel:* +393298061717 <%2B44%20%280%297827%20513%20156>