Key facts on Xi'an environment in 2014     Updated: 2019-01-31

Air quality

Days above Grade II*: 211 (18 days of Grade I)

*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: 57.8%

Annual average dust fall:14.64 tons/(sq m ×30 days), 14.2% lower than previous year

Rainfall ph value: 6.6

Acid rain sample: 0 

Water quality

The municipality's river water pollution alleviated, with overall pollution index dropping by 10.6% compared to the previous year.

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

100% of drinking water source reached the standard quality.

Outdoor noise

The environmental noise maintained a stable level in 2014, 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 2 passed the night-time noise standard.