"The auto industry has to be a partner in all efforts in the private sector in terms of combating climate change," said UN spokesman Stephane Dujarric.
"I hope the company, Volkswagen, cooperates fully and rectifies the issue," he said.
Volkswagen CEO Martin Winterkorn apologized for the scandal that has triggered investigations in the United States, France and South Korea, among other countries, sending company shares into a tailspin.
The cheating device affected nearly half a million vehicles sold in the United States.