• Home
  • >
  • Statistics
  • Environment
Key facts on Xi'an environment in 2020
en.xa.gov.cn     Updated: 2021-02-20

Air quality

Days above Grade II*: 250

*According to the criteria of the National Environment Air Quality Standard (GB 3095-2012), air quality is divided into six grades, in which the air pollution index is arranged in ascending order.

The proportion of days above Grade II: 68.3 percent

Annual average dust fall: 5.3 metric tons/ (square meters × 30 days), 33.8 percent lower than the previous year

Rainfall ph value: 7.01

Acid rain sample: 0

Water quality

The municipality's river water pollution level was reduced, with the overall pollution index dropping by 4.1 percent compared to the previous year.

14 rivers are listed here in descending order in terms of the severity of their water pollution level:

Xinhe River, Zaohe River, Linhe River, Haohe River, Yuhe River, Jinghe River, Taiping River, Shichuan River, Chanhe River, Laohe River, Weihe River, Fenghe River, Heihe River and Bahe River.

26 of the cross-sections for river water quality monitoring reached the national standard, according to the criteria of water environment functions.

100 percent of drinking water sources reached standard quality.

Outdoor noise

The level of environmental noise was stable in 2020, although a few areas were affected by construction noise and vehicle noise. According to international criteria, four of the five functional areas met the daytime noise standard, while one passed the nighttime noise standard.