Aerial photo taken on June 15, 2018 shows the scenery in Lingkongshan Town of Qinyuan County, north China's Shanxi Province. Having a forest coverage rate of 56.7 percent, the Qinyuan County, located in the east of Taiyue Mountain, has earned a fame of "natural oxygen bar". (Xinhua/Zhan Yan)

Aerial photo taken on June 13, 2018 shows the scenery in Lingkongshan Town of Qinyuan County, north China's Shanxi Province. Having a forest coverage rate of 56.7 percent, the Qinyuan County, located in the east of Taiyue Mountain, has earned a fame of "natural oxygen bar". (Xinhua/Zhan Yan)

Aerial photo taken on June 15, 2018 shows the Lingkongshan national nature reserve in Qinyuan County, north China's Shanxi Province. Having a forest coverage rate of 56.7 percent, the Qinyuan County, located in the east of Taiyue Mountain, has earned a fame of "natural oxygen bar". (Xinhua/Zhan Yan)

Aerial photo taken on June 13, 2018 shows the scenery in Lingkongshan Town of Qinyuan County, north China's Shanxi Province. Having a forest coverage rate of 56.7 percent, the Qinyuan County, located in the east of Taiyue Mountain, has earned a fame of "natural oxygen bar". (Xinhua/Zhan Yan)

Photo taken on June 14, 2018 shows a national wetland park in Qinyuan County, north China's Shanxi Province. Having a forest coverage rate of 56.7 percent, the Qinyuan County, located in the east of Taiyue Mountain, has earned a fame of "natural oxygen bar". (Xinhua/Zhan Yan)

Aerial photo taken on June 14, 2018 shows the forest in Qinyuan County, north China's Shanxi Province. Having a forest coverage rate of 56.7 percent, the Qinyuan County, located in the east of Taiyue Mountain, has earned a fame of "natural oxygen bar". (Xinhua/Zhan Yan)