Southwest China's Tibet has completed its water, air and soil monitoring networks and enhanced law enforcement to better protect environment, said a local official.

Twenty-three automatic air quality monitoring stations have been set up in major regional cities and along the Qinghai-Tibet railway, said Cering Yangzom, deputy head of the Environmental Protection Department of Tibet Autonomous Region.

The region has also selected 194 monitoring sites for surface water, 84 for air quality and 110 for drinking water sources, he added.

The regional environmental monitoring station has passed the national assessment.

To strengthen monitoring, the region has implemented plans for water and air pollution treatment and prevention, and will soon complete the drafting of a soil pollution prevention plan.

The region has also established a four-tier environmental monitoring network to enhance law enforcement, according to the official.

The plateau region remains one of the areas with the best environmental quality in the world. Projects with high energy demand, pollution and emissions are banned.