WHO stated that the H7N9 virus in China, which has killed seven people already, cannot be spread via human-to-human contact.
In recent months, the air pollution problem in China has received considerable attention from media outlets abroad.
On Sunday, the Chinese government announced that two people had died from an unusual strain of bird flu, with a third person hospitalized for a severe case of infection.
Over 3,000 pig carcasses were found floating in the Huangpu River near Shanghai, China.