久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

USEUROPEAFRICAASIA 中文雙語Fran?ais
China
Home / China / Society

Mist cannon among tools used to fight heavy smog

By Zheng Jinran | China Daily | Updated: 2016-12-05 07:37

Heavy smog that has been covering many cities in northern China has caused some authorities to bring out pollution-fighting artillery.

The mist cannon, which is not well-known but gaining popularity, is a large machine mounted on a truck that sprays water mist.

They were initially used at construction sites and mines to reduce dust. But engineers have improved the machines to make them release tinier droplets of mist for combating fine airborne particles, said Xu Yuexin, an engineer with Beijing Capital Group Boom-sound Environment Science & Technology Co Ltd, which provides the mist cannon service in parts of the capital.

"The truck works by nebulizing water into tiny particles, with diameters in microns, the same as PM2.5 and PM10, and spraying them into the air, and then they could combine with the dust and fine particles to fall to the ground," Xu said.

Experts have found they're effective, but have their limits. They are, officials said, only one of the measures being taken. Tough restrictions on emissions is still the best way to control air pollution for the longer term.

Beijing residents woke up to thick smog over the weekend, with the air pollution readings of 21 monitoring stations climbing to the most hazardous level in the early hours of Sunday. The visibility was reduced to within 500 meters in some areas.

The smog, which also covered vast areas of the country's north, was mainly a product of windless weather that was unable to disperse pollutants, according to environmental authorities in the affected areas.

The capital issued its second-highest warning against air pollution, an orange alert, on Thursday, one day before smog covered the city. Under an orange alert, the capital takes comprehensive measures to control the emissions from companies, vehicles and construction sites.

Implementation of restrictions under the alerts has been strengthened, officials said. In Beijing on Sunday, the alert prompted inspectors to monitor 533 companies and construction sites, and check over 57,800 vehicles, the municipal environmental bureau said.

The mist cannon trucks are being used to spray in the mornings, and do so more frequently, some three to five times, during smoggy days.

Authorities also spray special chemicals on the roads through regular watering vehicles once a week. The spray absorbs and consolidates the dust and pollutants from vehicle exhaust, Xu said.

The combination of the mist cannon and the chemicals "have been determined effective in reducing the fine particles", Xu said.

According to tests conducted by researchers with the China National Environmental Monitoring Center, the mist cannon and the chemicals can together "cut the PM10 by 20 percent, PM2.5 by 5 percent and nitrogen oxides by 10 percent", according to Xu.

There are two trucks covering 35 streets in the capital's Chaoyang district, mainly around the Olympic venues and regions where embassies are concentrated, because of the high population densities and frequency of events. The trucks started operating in October and plans call for them to continue to April 2017.

Li Gang, from the company's marketing department, said that additional districts in Beijing and other cities may adopt the services if the mist and chemicals perform well.

Many cities in northern China, including Xi'an in Shaanxi province and Zhangjiakou in Hebei province, have used mist cannons since 2014. There also is interest in them from cities this year such as Chengdu in Sichuan province and cities in Hunan province, officials said.

But Shi Guoliang, associate professor of environmental sciences at Nankai University in Tianjin, said, "The mist cannon did work in reducing the particles, but worked only for a limited time and region, yet it's better than doing nothing."

The government should pay more attention to implementing measures to cut the emissions at their source, he added.

zhengjinran@chinadaily.com.cn

Editor's picks
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
 
久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

    久久精品国产一区二区三| 蜜臀av一区二区| 欧美日韩亚洲综合一区二区三区| 香蕉久久一区二区不卡无毒影院| 制服丝袜成人动漫| 久久国产欧美日韩精品| 久久久久久久久一| 99国产精品久久| 性欧美疯狂xxxxbbbb| 日韩欧美国产成人一区二区| 国产高清在线观看免费不卡| 国产精品超碰97尤物18| 在线观看91视频| 麻豆视频观看网址久久| 亚洲国产精品ⅴa在线观看| 在线一区二区视频| 日韩精品免费视频人成| 久久久精品免费免费| 色综合久久综合| 美腿丝袜在线亚洲一区| 亚洲国产成人私人影院tom| 91黄色免费网站| 久久不见久久见免费视频1| 国产精品高清亚洲| 欧美精品丝袜久久久中文字幕| 精久久久久久久久久久| 亚洲人成人一区二区在线观看| 在线电影一区二区三区| 成人永久aaa| 亚洲成人第一页| 国产天堂亚洲国产碰碰| 欧美色图第一页| 国产成人综合在线观看| 一区二区三区精密机械公司| 精品国产乱码久久久久久久| 91视频观看免费| 精品一区二区三区在线播放 | 亚洲动漫第一页| 26uuu色噜噜精品一区| 色哟哟一区二区在线观看| 极品销魂美女一区二区三区| 亚洲精品网站在线观看| 久久综合狠狠综合| 精品视频在线免费看| 成人性生交大片免费看视频在线 | 一本一道波多野结衣一区二区| 另类小说欧美激情| 亚洲视频在线观看一区| 欧美成人vps| 欧美视频一区二区三区在线观看| 国产一区三区三区| 亚洲高清不卡在线| 亚洲色图.com| 久久精品一区蜜桃臀影院| 欧美日韩国产不卡| 91农村精品一区二区在线| 国产一区二区三区免费播放| 亚洲va欧美va人人爽| 中文字幕一区二区三区在线播放 | 久久综合色婷婷| 欧美高清视频在线高清观看mv色露露十八 | 91精品国产综合久久久蜜臀粉嫩| 9色porny自拍视频一区二区| 狠狠色丁香久久婷婷综合_中| 亚洲va中文字幕| 一区二区三区在线高清| 中文字幕成人av| 精品91自产拍在线观看一区| 67194成人在线观看| 色综合久久88色综合天天免费| 国产成人午夜精品5599 | 另类的小说在线视频另类成人小视频在线 | 亚洲美女淫视频| 中文字幕av一区二区三区免费看 | 久久精品国产精品亚洲精品| 亚洲v中文字幕| 亚洲综合一区二区精品导航| 国产精品国产三级国产aⅴ无密码 国产精品国产三级国产aⅴ原创 | 色噜噜狠狠色综合欧洲selulu| 国产成人在线视频网址| 狠狠色伊人亚洲综合成人| 美女视频免费一区| 日韩va亚洲va欧美va久久| 亚洲高清视频在线| 亚洲国产综合色| 一区二区三区**美女毛片| 综合色天天鬼久久鬼色| 欧美激情一区三区| 国产亚洲成aⅴ人片在线观看 | 麻豆成人免费电影| 日韩电影在线观看电影| 午夜久久久久久久久| 亚洲影院久久精品| 亚洲综合色噜噜狠狠| 一区二区三区高清| 亚洲国产毛片aaaaa无费看| 亚洲午夜免费电影| 亚洲国产精品一区二区久久恐怖片| 亚洲激情自拍视频| 樱花草国产18久久久久| 亚洲激情综合网| 亚洲成人自拍一区| 午夜电影一区二区三区| 日韩精品每日更新| 男人的j进女人的j一区| 美女在线一区二区| 另类调教123区| 国产一级精品在线| 国产高清在线精品| www.99精品| 日本精品免费观看高清观看| 欧美性猛交xxxxxx富婆| 欧美精品xxxxbbbb| 精品国产一区二区三区久久影院 | 在线观看免费亚洲| 欧美日韩国产高清一区二区三区| 51久久夜色精品国产麻豆| 日韩亚洲欧美成人一区| 精品国产精品网麻豆系列| 国产亚洲人成网站| 亚洲欧洲av另类| 亚洲一区二区欧美| 日本高清免费不卡视频| 欧美三区在线观看| 日韩亚洲电影在线| 久久免费电影网| 国产精品久久久久三级| 亚洲另类中文字| 无码av中文一区二区三区桃花岛| 另类小说欧美激情| 成人蜜臀av电影| 欧美伊人久久大香线蕉综合69| 欧美日本在线视频| 欧美精品一区二区在线播放| 中文字幕不卡三区| 亚洲成人动漫在线免费观看| 麻豆91在线观看| 成人免费高清视频在线观看| 91精品福利视频| 日韩亚洲欧美一区| 国产精品麻豆欧美日韩ww| 一区二区高清免费观看影视大全| 日本成人在线看| 国产精品911| 在线观看亚洲精品| 欧美电视剧免费观看| 国产精品不卡在线观看| 五月综合激情网| 国产传媒一区在线| 在线免费观看视频一区| 精品少妇一区二区三区日产乱码 | 欧美一区午夜视频在线观看| 久久久国产精华| 亚洲综合一区二区精品导航| 韩国午夜理伦三级不卡影院| 97aⅴ精品视频一二三区| 欧美一区二区在线播放| 国产精品天天看| 日本美女视频一区二区| 成人看片黄a免费看在线| 欧美片在线播放| 国产精品青草综合久久久久99| 午夜精品久久久久| 成人一区在线观看| 欧美高清一级片在线| 中文字幕一区二区三区在线播放 | 欧美电影在线免费观看| 国产精品青草综合久久久久99| 日韩电影一区二区三区| 96av麻豆蜜桃一区二区| 欧美大尺度电影在线| 一区二区三区在线观看欧美| 国产麻豆精品95视频| 欧美日韩五月天| 中文字幕一区二区三区四区| 精品一区二区三区视频| 欧美色综合网站| 欧美日韩中文字幕一区| 一区在线播放视频| 国内精品伊人久久久久影院对白| 在线视频一区二区三| 国产偷国产偷精品高清尤物| 秋霞影院一区二区| 色狠狠综合天天综合综合| 久久久国产一区二区三区四区小说 | 精品sm在线观看| 天天综合色天天综合色h| av在线播放一区二区三区| 精品国产a毛片| 丝袜美腿高跟呻吟高潮一区| 91麻豆国产福利在线观看| 久久久国产午夜精品| 久久精品国产一区二区| 欧美午夜视频网站| 亚洲日穴在线视频| 国产成人av福利| 精品久久五月天| 日韩精品福利网| 精品1区2区3区| 亚洲美女区一区|