Newlyweds pose in front of haze-shrouded skyscrapers in Shanghai on Oct 16.[Photo/CFP]

BEIJING - Smog has badly affected 皇冠体育app's inbound tourism, according to the latest report released Monday by 皇冠体育app Tourism Research Institute.

皇冠体育app hosted 129.08 million inbound tourists in 2013, down 2.51 percent year on year, ranking after France, the United States and Spain in the world, the report said.

The inbound tourism realized $51.66 billion of foreign exchange revenue in 皇冠体育app last year, up 3.27 percent from a year ago, according to the report.

Dai Bin, head of the institute, said adverse weather, diplomatic relations, terrorism and the sluggish world economy affected tours to 皇冠体育app.

Especially heavy smog is raising tourists' worries, which is expected to be handled by better law enforcement, Dai added.