The overall urban air quality of China was good, better than that of last year but some cities were still subject to relatively heavy pollution. The acid rain distribution areas in China remained stable, however, acid rain pollution was still relatively heavy.
In 2008, a total of 519 cities in China reported their air quality. 21 (taking up 4.0£¥) of them met Grade I national air quality standard; 378 (taking up 72.8%) met Grade II standard; 113 (taking up 21.8%) met Grade III standard and 7 (accounting for 1.4%) failed to meet Grade III standard. 71.6% of cities at prefecture level or above across China met Grade I or II standard, 85.6% cities at county level or above met Grade I or II standard.
Cities at or above prefecture level Among the cities at prefecture level or above, 2.2% met Grade I national air quality standard, 69.4% met Grade II standard, 26.9% met Grade III standard and 1.5% failed to meet Grade III standard.
Percent of cities with different PM10 concentration
The annual average PM10 concentration of 81.5% cities met Grade II standard, while 0.6% failed to meet Grade III standard. The PM10 concentration of over 20% cities at prefecture level in eight provinces including Shandong, Shaanxi, Xinjiang, Inner Mongolia, Hubei, Jiangsu, Gansu and Hunan subject to environmental statistics failed to meet Grade II air quality standard.
Percent of cities with different concentration of sulfur dioxide
The annual average of SO2 concentration of 85.2% cities met Grade I or II standard, while 0.6% of them failed to meet Grade III standard. More than 20% of the prefecture level cities in 7 provinces including Guizhou, Shandong, Hebei, Shanxi, Inner Mongolia, Sichuan and Hunan subject to environmental statistics failed to meet Grade II air quality standard in terms of SO2.
The annual average of NO2 concentration of all cities at prefecture level or above met Grade II standard and 87.7% of them met Grade I standard.
Air quality distribution of key cities
Key cities The urban air quality of 113 key cities on environmental protection enjoyed some improvement. 57.5% of them met Grade II standard; 41.6% met Grade III standard and 0.9% failed to meet Grade III standard. The percent of cities meeting air quality standard went up by 13.3 percentage points compared with that of last year, but there was no change of the percent of cities failing to meet Grade III standard.
The overall average NO2 concentration of key cities on environmental protection in 2008 was similar to that of 2007, but SO2 and PM10 concentrations had some drop.
Annual comparison of major pollutant concentrations of key cities
Acid rain frequency Among the 477 cities (counties) under monitoring, 252 had acid rain, taking up 52.8%. 164 cities had acid rain frequency over 25%, accounting for 34.4%; 55 cities had acid rain frequency over 75%, accounting for 11.5%.
Comparison of the percent of cities with different acid rain frequency
Precipitation Acidity The percent of cities with relatively heavy acid rain (pH <5.0) went down by 1.1 percentage point compared with that of last year, while the percent of cities with heavy acid rain (pH<4.5) kept the same.
Comparison of the percent of cities with different annual average precipatiation pH
Acid rain distribution Acid rain mainly concentrated in the region south to the Yangtze River and east to Sichuan and Yunnan, including Zhejiang, Fujian, Jiangxi, most of Hunan and Chongqing as well as the Yangtze River delta and Pearl River delta. The acid rain distribution areas across China maintained stable compared with that of last year.
Isoline of annual average pH value of precipitation in China
Emissions of Major Pollutants from waste Gas
In 2008, total emission was 23.212 million t for SO2, 9.016 million t for smoke and 5.849 million t for industrial dust; down by 5.9%, 8.6% and 16.3% respectively compared with that of 2007.
Measures and Actions
¡¾The Implementation of China Stage III Standard for Vehicle Emissions¡¿ In order to implement the Law of the People's Republic of China on the Prevention and Control of Atmospheric Pollution and control vehicle emission pollution, China officially began the implementation of the stage III limit of the Limit and Measurement Method for the Emissions of Pollutants of Light Duty Vehicles (China Stage III and IV) (GB18352.3-2005) (hereinafter referred to as "China stage III standard") from July 1, 2008
¡¾Beijing carried out National Stage IV Standard for Vehicle Emissions beginning from March 1, 2008¡¿ According to Beijing Environmental Protection Plan during the "11th Five-Year Plan" period and the requirement for holding 2008 Summer Olympic Games, Beijing began implementing National IV vehicle emission standard from March 1, 2008 in two stages, which is equivalent to EU IV standard.