"The need for toilets is huge, and the subway company should build them to help address the problem, and avoid similar cases in the future," Han said.
"Mobile toilets should also be installed near metro stations," he added.
Meanwhile, Peng Peng, a researcher with the Guangzhou Academy of Social Sciences, said that parents and schools should also teach children to not urinate anywhere.
'Gangnam style' life of young rich in Chongqing