Current situation and key challenges on the use of single-use plastic in Hanoi.

• This paper investigates the daily single-use plastic waste generation by Hanoi households and offers recommendations to improve existing policy gaps in Vietnam. • Most plastic shopping bags are temporarily reused to line kitchen bins among Hanoi households. • Most single-use plastic waste is disposed of in landfills, while recycling remains limited. • Plastic shopping bags and plastic packaging for food are used more often in rural areas than in urban areas on average. • Policies such as a tax on plastic bags and source separation are in place, but implementation is inconsistent. Marine plastic litter, mostly comprising single-use plastics, has been recognised as one of the world's most urgent environmental concerns, and Vietnam has been ranked as one of the top five countries polluting the ocean with plastic waste. This paper examines Hanoi as a case study on single-use plastic by households, investigating the daily generation of single-use plastic waste through a survey, assessing existing policy gaps through a policy review, and providing recommendations on improving management along the supply chain in Vietnam. At almost 27 times a week on average, plastic shopping bags were found to be the most prevalent single-use plastic used by households, followed by wrap/film, straws, coffee cups with plastic lids, cutlery, takeout containers, food packaging, party cups, bottles for water and beverages, and other items. Plastic shopping bags and food packaging are used more often in rural areas than in urban areas. These bags also have a high rate (68.65%) of temporary reuse as kitchen bin liners, a habit that may be difficult to change over the short term. Apart from some components of plastic bottles and packaging that are sold for recycling, most single-use plastic waste is disposed in landfills. Policies are in place to address plastic issues, such as a tax on plastic bags and source separation, but implementation is inconsistent. A behaviour-based combination of top-town and bottom-up approaches along the entire supply chain is recommended to improve existing policy gaps in Vietnam. [ABSTRACT FROM AUTHOR]