HONG KONG — Smog and corruption are among the problems that the Chinese government has vowed to combat.

Now another problem, which lies right under many tourists’ noses, is in the authorities’ cross hairs: unsightly toilets.

The China National Tourism Administration, a government agency, announced a five-year plan in December to enhance the country’s tourism industry, including a project to build, expand and renovate 100,000 toilets in scenic areas and along tourist routes. The plan complements a campaign to add 57,000 modern public toilets nationwide by late 2017.

The agency’s chairman, Li Jinzao, has said that a failure to upgrade toilets could damage the reputation of China’s tourism industry, which the United Nations said earned $114 billion from international visitors in 2015, second only to the United States.