A tourist visits a scenic spot at Donghu area in Kaiping District of Tangshan City, north China's Hebei Province, Sept. 17, 2020. Tangshan has cleaned up 72 polluting enterprises and 327 abandoned courtyards without owners in Donghu since 2018 and transformed the polluted zone into a leisure and sightseeing area. (Xinhua/Yang Shiyao)

Aerial photo taken on Sept. 17, 2020 shows a view of a scenic spot at Donghu area in Kaiping District of Tangshan City, north China's Hebei Province. Tangshan has cleaned up 72 polluting enterprises and 327 abandoned courtyards without owners in Donghu since 2018 and transformed the polluted zone into a leisure and sightseeing area. (Xinhua/Yang Shiyao)

Tourists take selfie in a scenic spot at Donghu area in Kaiping District of Tangshan City, north China's Hebei Province, Sept. 17, 2020. Tangshan has cleaned up 72 polluting enterprises and 327 abandoned courtyards without owners in Donghu since 2018 and transformed the polluted zone into a leisure and sightseeing area. (Xinhua/Yang Shiyao)

Aerial photo taken on Sept. 17, 2020 shows a view of a scenic spot at Donghu area in Kaiping District of Tangshan City, north China's Hebei Province. Tangshan has cleaned up 72 polluting enterprises and 327 abandoned courtyards without owners in Donghu since 2018 and transformed the polluted zone into a leisure and sightseeing area. (Xinhua/Yang Shiyao)

Cyclists ride in a scenic spot at Donghu area in Kaiping District of Tangshan City, north China's Hebei Province, Sept. 17, 2020. Tangshan has cleaned up 72 polluting enterprises and 327 abandoned courtyards without owners in Donghu since 2018 and transformed the polluted zone into a leisure and sightseeing area. (Xinhua/Yang Shiyao)