Officials of Guiyang, capital city of Southwest China's Guizhou province, has vowed to further improve local air quality.

"The fresh air is the city's ecological advantage that we cannot lose," said Chen Gang, Party secretary of Guiyang.

Guiyang, one of the most livable cities in China, used to suffer from acid rain in the late 20th century.

The city's air quality has improved dramatically in recent years because of the local government's effective measures and policies.

Statistics show that Guiyang's average air purification rate is 86 percent in 2014 without any heavy pollution reported, and the rate reached 100 percent in five months of 2014.

The average air quality index rose by 5.8 percent from January to April of 2015, compared with the same period of last year.

Its environmental protection department says that dust accounted for 29 percent of its pollution last year,

"Most of the dust came from construction sites and transportation so Guiyang has worked to control the sources of pollutants at construction sites, roads and waste sites for construction materials," said Sun Zhonghua, director of the Guiyang Ecology Committee.

Some 1318 construction sites in Guiyang have been put under the supervision and monitoring of the environmental protection department since last year.

Liu Wenxin, mayor of Guiyang, said there are dozens of automatic monitoring stations in Guiyang to track the city's air quality. The head of relevant departments will receive message alerts automatically sent from the stations onto their mobile phones once air quality deteriorates.

In doing so, the city put 1,318 construction sites under environmental protection dept supervision, and Guiyang’s mayor, Liu Wenxin, notes that they put dozens of monitoring stations in Guiyang to track air quality, with department heads receiving alerts automatically on their mobile phones if the air quality deteriorates.