• Home
  • >
  • Statistics
  • Environment
Key facts on Xi'an environment in 2017
en.xa.gov.cn     Updated: 2019-01-31

Air quality

Days above Grade II*: 180

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

Proportions of days above Grade II: 49.3%

Annual average dust fall:13.2 tons/(sq m ×30 days), 5.0% lower than previous year

Rainfall ph value:6.7

Acid rain sample: 0

Water quality

The municipality's river water pollution alleviated, with overall pollution index dropping by 19.9% compared to the previous year.

Rivers are listed here in descending sequence in terms of the severity of water pollution level:

Zaohe River, Xinhe River, Linhe River, Jinghe River, Haohe River, Juehe River, Shichuan River, Linghe River, Weihe River, Fenghe River, Chanhe River, Bahe River, Heihe River, Laohe River, and Wangchuan River.

16 of the cross-sections for river water quality monitoring reached the standard, according to the criteria based on functions of water environment.

98.1% of drinking water source reached standard quality.

Outdoor noise

The environmental noise maintained a stable level in 2017, except a few areas were increasingly affected by construction noise. According to the international criteria, 4 out of 5 functioning areas met the daytime noise standard, while only 1 passed the night-time noise standard.