How many sunny and foggy days are there in a year?

The Ministry of Environmental Protection of China announced the air quality of 74 cities in Beijing in 20 14, including Beijing-Tianjin-Hebei, Yangtze River Delta and Pearl River Delta. The results show that Beijing-Tianjin-Hebei occupied eight seats among the ten cities with the worst air in China in 20 14.

According to the assessment of the Ministry of Environmental Protection, China's air pollution situation is still grim, and the frequent occurrence of heavy pollution weather has not been fundamentally improved.

In the winter of 20 12, the land area of China14 and about 600 million people were affected by smog; In 20 13, the average number of haze days in China is the highest in 52 years; From the autumn of 20 14 to the beginning of 20 15, dense fog frequently patronizes.

According to the "Red and Black List" of urban air quality published by the Ministry of Environmental Protection on 20 14, the ten cities with the worst air quality are Baoding, Xingtai, Shijiazhuang, Tangshan, Handan, Hengshui, Jinan, Langfang, Zhengzhou and Tianjin. The top ten cities are Haikou, Zhoushan, Lhasa, Shenzhen, Zhuhai, Huizhou, Fuzhou, Xiamen, Kunming and Zhongshan.

The air quality in Beijing, Tianjin and Hebei is relatively poor. The average number of days for air quality in 13 cities at prefecture level and above in this region is 156 days, which is 85 days less than the average level. The proportion of days with severe pollution or above is 17.0%, which is 1 1.4 percentage points higher than the average of 74 cities. Among the top 20 most polluted cities in China, there are 1 1 cities, and 8 of the top1cities are located in Beijing, Tianjin and Hebei. The average annual concentration of PM2.5 in the region exceeds the standard 1.6 times.

The average number of days of air quality reaching the standard in 25 cities in the Yangtze River Delta region is 254 days, which is 13 days more than the national average, and the average number of days reaching the standard is 69.5%. Among the days exceeding the standard, PM2.5 (fine particles) is the most important pollutant, and the average annual concentration of PM2.5 in the region is 60 micrograms per cubic meter.

The average days of air quality reaching the standard in 9 cities in the Pearl River Delta region are 298 days, and the average days of reaching the standard are 8 1.6%. Ozone is the most important pollutant in the days exceeding the standard.

"Compared with 20 13, the air quality in 74 key cities has generally improved," said an official of the Ministry of Environmental Protection. The average number of days to reach the standard in 74 key cities has increased from 60.5% to 66.0%. The average proportion of days with severe and above pollution decreased from 8.6% to 5.6%.

However, the Ministry of Environmental Protection admits that the current air pollution situation in China is still grim, and the three key areas are areas with relatively heavy air pollution; Traditional soot pollution, automobile exhaust pollution and secondary pollution are superimposed on each other, and the characteristics of compound pollution are outstanding. Especially at present, the heavily polluted weather in China has not been effectively curbed. In February of 20 14 and February of 10, two large-scale heavily polluted weather with long duration and heavy pollution occurred in China.

Haze is harmful to human health. Puwechat Tmall is imported from the United States.