www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

US EUROPE AFRICA ASIA 中文
China / Society

Anti-smog gains marred by rising ozone levels

By Wu Wencong (China Daily) Updated: 2014-07-22 08:14

China's air quality improved slightly in the first half of 2014 compared with the same period in 2013, but aggravated ozone pollution became a prominent problem across the country, according to Environmental Protection Ministry figures released on Monday.

In 74 major cities, air quality was good 60.3 percent of the time from January to June. The figure was 58.7 percent during that period in 2013. In addition, the frequency, duration and pollution concentration of severely polluted days all decreased this year.

A ministry official who wished to remain anonymous said the improvement came from tougher policies adopted after the Airborne Pollution Prevention and Control Action Plan was issued in September 2013, and more favorable weather conditions.

But the rising ozone level marred the overall improvement. Ozone concentration increased by 6.8 percent nationwide - it was as high as 12.8 percent in the Yangtze River Delta region.

Although ozone is beneficial in the stratosphere, blocking ultraviolet rays from reaching Earth, high ozone levels at low altitudes can irritate the eyes and irreversibly damage the lungs and central nervous system. Adding to the danger, ozone pollution is easily shrugged off by the public because it does not affect visibility, said Chai Fahe, vice-president of the Chinese Research Academy of Environmental Sciences.

Chai said ozone levels can be raised by natural conditions such as stronger sunshine and higher temperatures, and by manmade factors such as growing concentrations of nitrogen oxide and volatile organic compounds.

"The total of nitrogen oxide emissions has just reached the peak, but VOCs are still increasing because they are just beginning to be controlled," he said.

The higher average temperature in the first half of 2014, compared with last year, is also likely a factor, he said.

Regionally, air quality improved in the Beijing-Tianjin-Hebei cluster, by 3.2 percent, in 2014. But it decreased by 0.5 percent in the Yangtze River Delta region, and by 0.8 percent in the Pearl River Delta.

"The results reflected the level of efforts made by the government bodies of the three regions," said Chai. "Policies being adopted in the Beijing-Tianjin-Hebei cluster are unparalleled in the nation."

But despite these efforts, eight of the 10 cities with the worst air quality in the first half of 2014 are in that region. The 10 cities were Xingtai, Shijiazhuang, Baoding, Tangshan, Handan, Hengshui and Langfang, all in Hebei province; Jinan in Shandong province; Xi'an in Shaanxi province and Tianjin.

wuwencong@chinadaily.com.cn

Anti-smog gains marred by rising ozone levels Anti-smog gains marred by rising ozone levels
 Wuhan area wrapped in smog  Coke adds more fizz in China with smog incentives

Highlights
Hot Topics
...
主站蜘蛛池模板: 亚洲精品美女在线观看 | 美女成人网| 精品亚洲永久免费精品 | 一级片免费观看 | 免费观看a视频 | 91看片淫黄大片.在线天堂 | 91老色批网站免费看 | 大陆精品自在线拍国语 | 精品一区二区三区免费毛片爱 | 黄色资源网址 | 亚洲第一成人天堂第一 | 欧美日韩在线观看一区 | 亚洲国产精品热久久2022 | 久艹在线观看视频 | 亚洲黄区 | 日本韩国三级在线观看 | 亚洲欧美一区二区视频 | 美女张开双腿让男人桶 | 免费人成黄页在线观看视频国产 | 日韩精品毛片 | 欧美一级淫片a免费播放口aaa | 第一色区| 亚洲高清在线观看视频 | 制服丝袜在线视频香蕉 | 欧美另类在线观看 | 久久久久欧美精品 | 九九亚洲视频 | 久久久久国产视频 | 99视频在线看观免费 | 欧美巨大另类极品videohd | 91精品国产高清久久久久久91 | 久久91综合国产91久久精品 | 国产国产人免费人成成免视频 | 欧美高清不卡 | 免费成人毛片 | 色婷婷91 | 国产成人免费高清在线观看 | 日本草草影院 | 国产粉嫩高中生无套第一次 | 国产天堂亚洲精品 | 精品色综合 |