MEP official recently released air quality of key regions and 74 cities in July 2013, which included Beijing-Tianjin-Hebei Province, the Yangtze River Delta, the Pearl River Delta, municipalities, provincial capital cities and cities separately listed on the state plan.
Monitoring results showed, in July, days with up-to-standard air quality in the 74 cities accounted for 12.9%-100%, averaging 70.7%. Air quality of 29.3% of the days were not pleasant including 21.1% rated as slight pollution, 6.5% intermediate pollution and 1.7% heavy pollution. 11 cities experienced good air quality throughout the month including Haikou, Lhasa and Zhuhai and 25 cities including Zhaoqing, Zhongshan and Zhenjiang had at least 80% of the days with up-to-standard air quality. The proportion of days with up-to-standard air quality in 21 cities ranged between 50%-80% such as Lianyungang, Ningbo and Jinhua while that of 17 cities was lower than 50%. Days that failed to meet air quality standard were mostly polluted by O3 and PM2.5, taking up 71.6% and 24.0% respectively. Compared with June, the number of days with up-to-standard air quality in the 74 cities in July increased by 6.3 percentage points whereas that of heavy pollution and serious pollution fell by 3.2 percentage points and 0.4 percentage points respectively. Concentrations of primary pollutants have all lowered. Evaluated by comprehensive urban air quality index, the most polluted cities in July are Tangshang, Handan, Shijiazhuang, Jinan, Xingtai, Tianjin, Baoding, Lanzhou, Zhengzhou and Hengshui and the top ten cities with good air quality include Haikou, Zhuhai, Guiyang, Yinchuan, Zhongshan, Kunming, Huizhou, Nanning, Shenzhen and Fuzhou.
Among the 13 cities in Beijing-Tianjin-Hebei Province, days with up-to-standard air quality ranged between 12.9% and 71.0%. Days with up-to-standard air quality accounted for 36.5% on average and the average days with air pollution took up 63.5% including 3.7% serious pollution. Days with up-to-standard air quality in Zhangjiakou, Chengde and Qinhuangdao made up 71.0%, 67.7% and 54.8% respectively and the ratio in other cities posted less than 50%. Air pollution in Beijing-Tianjin-Hebei Province is mostly affected by PM2.5, which accounted for 48.8% of the total polluted days. Compared with June, air quality in the region has turned better with average up-to-standard days increasing from 24.2% to 36.5%, up 12.3 percentage points.
The days with up-to-standard air quality in the 25 cities in the Yangtze River Delta ranged between 29.0% and 100.0% with average proportion being 73.5%., 2.8 percentage points higher than the average of the 74 cities. Days with air pollution in the region averaged 26.5% including 1.0% days of serious pollution. Lishui and Quzhou had all the days with up-to-standard air quality. Air quality meeting the standard accounted for 80%-100% of the total days in 9 cities including Zhenjiang, Suqian and Nanjing while Shanghai, Suzhou, Jiaxing and Hangzhou had less than 50% of up-to-standard days. The Yangtze River Delta is mostly polluted by O3, accounting for 98.0% of the total and PM2.5 came the next, accounting for 2.0%. Days with up-to-standard air quality in Shanghai in July accounted for 29.0%, down 37.7 percentage points compared with that of June and the proportion of serious pollution days rose by 6.5 percentage points.
Days with up-to-standard air quality in the 9 cities in the Pearl River Dealt ranged between 74.2% and 100%, averaging 90.3%. Air quality in Zhuhai, Zhaoqing, Zhongshan, Shenzhen, Jiangmen, Huizhou, Dongguan and Foshan experienced good air quality with 80% of the days meeting the standard. All the pollution days in the region was affected by O3. Compared with June, the average ratio of days with up-to-standard air quality in the 9 cities of the region increased from 88.5% to 90.3%.