Sanya in the island province of Hainan tops the list of smog-escape routes since it offers blue skies, blue seas and warm weather. [Photo by Bao Xinguo/China Daily]

Travel agencies are pitching popular "smog-escape routes" to attract those looking to get away from air pollution.

According to the country's largest online travel agency, Ctrip, the top domestic smog-escape routes last month were Sanya in the island province of Hainan; Heilongjiang's provincial capital, Harbin; Yunnan's provincial capital, Kunming, and Lijiang city; the Guangxi Zhuang autonomous region's Guilin; Fujian province's Xiamen; Sichuan province's Jiuzhaigou Valley; and Hunan province's Zhangjiajie natural area.

Ctrip has also released a list of its most popular domestic "smog-escape routes" for January and February.

By combing the lists, we can see the most popular smog-free destinations in China.