Experts from the United Nations Environment Programme are scheduled to visit the Capital later this month to help prevent global exchange of Ozone Depleting Substances (ODS). The visit comes after the UNEP signed an MoU with the National Academy of Customs, Excise and Narcotics (NACEN) towards effective monitoring of ODS across the borders. NACEN, the apex body for training of personnel of Custom, Central Excise, Narcotics and other law enforcement agencies, will now be the first agency in Asia-Pacific to impart training in identification and monitoring of ODS .