The event was jointly held by the Thua Thien-Hue People’s Committee and the Central Vietnam Women's Union.
At the ceremony, representatives from Thua Thien-Hue and agencies pledged to protect the environment and reduce plastic waste.
The women performed a dance to call the public to work together to mitigate the use of plastic.
They also cycled around the city centre with slogans on environmental protection.
The image of the conical hat and purple traditional long dress ao dai is a distinctive feature of women in Thua Thien-Hue.