Electronic waste is rising sharply across Asia as higher incomes allow hundreds of millions of people to buy smartphones and other gadgets, with serious consequences for human health and the environment, according to a UN study released Sunday.

So-called e-waste in Asia has jumped 63 percent in five years, the report by the United Nations University said, as it warned of a need for most nations across the region to improve recycling and disposal methods.

China more than doubled its own generation of e-waste between 2010 and 2015, the period of the study, according to the report.

Per capita the worst-offending economy in the region was Hong Kong, with each person in the Chinese territory generating an average of 21.7 kilograms of e-waste in 2015.

Singapore and Taiwan were also big e-waste dumpers, with just over 19 kilograms per person generated in 2015, according to the study.