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 / China

Purifier makers must remove cloud of doubt over quality

By Xu Wei | China Daily | Updated: 2014-01-04 07:20

Experts have called for a renewed national standard on air purifiers and for producers to clear the air on their effectiveness.

The pollution that has shrouded vast areas in East China since December has seen sales of these appliances soar.

However, the market needs stricter supervision and higher national standards, experts said.

The pollution, especially concerns over high levels of PM2.5 - air particles smaller than 2.5 microns that are able to enter the lungs - has resulted in a surge of interest in air purifiers, said Song Guangsheng, director of the National Indoor Environment and Indoor Environmental Product Quality Supervision Center.

"Years ago, 80 percent of people who purchased purifiers did it to get rid of the paint smell in new homes," he said.

The national standard on indoor air cleaners, enacted in 2008, did not take into consideration the need for consumers to filter PM2.5 and increased use by consumers, he added.

Despite most air cleaners being effective in absorbing particulates, there are concerns about their effectiveness.

"Some producers boast their cleaners can handle 99.99 percent of air particles," Song said. "But these results are from tests covering an area of 3 or 4 square meters and within a time period of three hours."

According to a spot check on 20 air cleaner products by the Shanghai Bureau of Quality and Technical Supervision, only products by three producers indicated the space in which they can effectively function, or reached the advertised standard.

"No matter whether it is a problem with the hardware or failure to state the performance data of the devices, they can mislead consumers," the organization said on Dec 6.

Meanwhile, a test of air cleaners by the Shanghai Consumer Council found some products failed to indicate clearly their performance data, with the Clean Air Delivery Rate - the cubic feet per minute of air that has had all the particles of a given size removed - of six products failing to reach their own target.

Eight of 22 products tested failed to clearly indicate the effective space in which the product can function.

Song said a revision to the national standard that requires air cleaners to mark clearly the occupied space in which the cleaner effectively functions, is needed.

"China doesn't have a comprehensive evaluation method for air purifiers, which makes the drafting of a renewed national standard difficult," he said.

Various types of air cleaners designed to remove certain types of pollutants also make the drafting of a unified national standard difficult.

Mo Jinhan, a researcher at Tsinghua University, said the new national standard should also include the product's service life.

"Most cleaners work well and can filter particles. The only difference is the service life and maintenance costs," he said.

Song warned that air cleaners require proper maintenance and that filters must be replaced on a regular basis.

"If the filters are not replaced, they will become a source of pollution because the air it distributes will be polluted," Song said.

Electronic air cleaners use a process called electrostatic attraction to trap charged particles, but they must be used in a ventilated environment to discharge ozone generated in the process.

xuwei@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

    国产揄拍国内精品对白| 麻豆精品精品国产自在97香蕉| 99综合电影在线视频| 国产精品久久久久三级| 成人黄色大片在线观看| 亚洲日本一区二区三区| 日本精品视频一区二区| 午夜一区二区三区视频| 91精品在线一区二区| 久久99国产乱子伦精品免费| 精品国产乱码久久久久久老虎| 国产乱人伦偷精品视频免下载| 国产亚洲欧美日韩俺去了| 成人午夜伦理影院| 中文字幕一区二区三中文字幕| 成人免费视频caoporn| 亚洲精品免费电影| 69堂国产成人免费视频| 午夜激情综合网| 欧美区一区二区三区| 精一区二区三区| 国产欧美日韩不卡| 在线免费观看一区| 久久国产精品一区二区| 亚洲国产岛国毛片在线| 欧美色视频在线观看| 美国一区二区三区在线播放| 欧美极品少妇xxxxⅹ高跟鞋| 成人激情校园春色| 亚洲天堂免费看| 欧美精品丝袜中出| 日本aⅴ精品一区二区三区| 久久蜜桃av一区精品变态类天堂 | 91色porny蝌蚪| 天天色图综合网| xnxx国产精品| 色婷婷久久99综合精品jk白丝| 婷婷亚洲久悠悠色悠在线播放 | 欧美高清精品3d| 国产精品一区二区在线看| 国产精品久久久久影视| 欧美日韩精品是欧美日韩精品| 日日夜夜免费精品视频| 久久久亚洲午夜电影| 色综合网站在线| 免费精品视频最新在线| 欧美高清在线精品一区| 欧美性大战久久久| 国产精品一品二品| 亚洲资源在线观看| 亚洲精品一区二区三区在线观看| av在线这里只有精品| 婷婷综合五月天| 国产精品毛片久久久久久久| 欧美日本国产一区| 波多野结衣视频一区| 天堂va蜜桃一区二区三区漫画版| 日本一区二区综合亚洲| 欧美卡1卡2卡| 91一区二区三区在线播放| 美女被吸乳得到大胸91| 国产精品国产三级国产普通话99| 欧美日韩亚洲丝袜制服| 国产经典欧美精品| 日韩国产精品91| 中文字幕字幕中文在线中不卡视频| 欧美一级电影网站| 日本高清无吗v一区| 国产酒店精品激情| 青青草国产成人av片免费 | 亚洲国产电影在线观看| 欧美性一二三区| 国产精品综合二区| 日韩成人av影视| 肉肉av福利一精品导航| 欧美性大战久久| 精品一区二区三区日韩| 亚洲激情成人在线| 国产日韩欧美一区二区三区综合| 56国语精品自产拍在线观看| 国产乱子伦视频一区二区三区 | 精品精品国产高清一毛片一天堂| 色婷婷av一区二区三区gif| 国产呦萝稀缺另类资源| 午夜精品一区二区三区三上悠亚 | 日韩一级片在线观看| 色综合久久中文综合久久97| 国产乱理伦片在线观看夜一区 | 亚洲欧美自拍偷拍色图| 91.麻豆视频| 91啪亚洲精品| 不卡高清视频专区| 国产成人aaa| 国产一区在线看| 麻豆视频一区二区| 日欧美一区二区| 亚洲国产成人tv| 亚洲男人电影天堂| 亚洲啪啪综合av一区二区三区| 久久精品欧美一区二区三区不卡 | 日韩视频中午一区| 91久久香蕉国产日韩欧美9色| 不卡一卡二卡三乱码免费网站| 国产黄色精品视频| 国产一区二区三区日韩| 韩国一区二区视频| 看电视剧不卡顿的网站| 日本不卡视频在线观看| 爽好多水快深点欧美视频| 亚洲国产综合91精品麻豆| 国产激情一区二区三区四区| 麻豆91精品视频| 蜜臀av一区二区三区| 蜜臀久久99精品久久久画质超高清| 亚洲欧美日韩久久| 亚洲天堂2014| 亚洲精品一二三区| 一区二区三区在线不卡| 一区二区久久久久| 亚洲h在线观看| 爽好久久久欧美精品| 首页亚洲欧美制服丝腿| 蜜臀久久久99精品久久久久久| 免费一级片91| 激情久久久久久久久久久久久久久久| 日韩电影在线免费观看| 奇米四色…亚洲| 青青草97国产精品免费观看无弹窗版| 免费成人深夜小野草| 免费视频最近日韩| 精品一区二区三区久久久| 国产剧情在线观看一区二区| 豆国产96在线|亚洲| 成人精品鲁一区一区二区| 成人aa视频在线观看| 色丁香久综合在线久综合在线观看| 欧美视频你懂的| 欧美色手机在线观看| 欧美一级艳片视频免费观看| 久久久精品黄色| 一区二区三区四区精品在线视频| 婷婷久久综合九色国产成人| 久88久久88久久久| av在线播放成人| 3d动漫精品啪啪1区2区免费 | 欧美mv和日韩mv的网站| 欧美激情综合在线| 亚洲综合在线视频| 久久国产精品99精品国产| 成人黄色免费短视频| 欧美日韩一区国产| 久久精品欧美一区二区三区不卡 | 国产精品91一区二区| 色哟哟亚洲精品| 日韩女优av电影在线观看| 中文字幕乱码久久午夜不卡| 香蕉影视欧美成人| 粉嫩av一区二区三区| 欧美日韩久久一区| 国产欧美精品国产国产专区| 亚洲第一主播视频| 懂色av一区二区在线播放| 欧美日韩视频一区二区| wwwwxxxxx欧美| 亚洲一区二区三区在线播放| 精品一区二区三区在线观看| 91免费国产在线| 欧美一二三在线| 成人免费一区二区三区视频| 麻豆91小视频| 91福利国产成人精品照片| 精品国产乱码久久久久久夜甘婷婷 | 欧美精品视频www在线观看| 久久精品一区二区三区不卡 | 美女视频黄a大片欧美| 97久久精品人人澡人人爽| 欧美v日韩v国产v| 亚洲久草在线视频| 国产在线精品一区二区不卡了| 欧美性猛片aaaaaaa做受| 中文字幕av一区二区三区| 人禽交欧美网站| 色狠狠一区二区| 中文字幕第一区二区| 日韩电影在线观看网站| 91欧美激情一区二区三区成人| 久久久久久亚洲综合影院红桃 | 波多野结衣在线一区| 日韩三级免费观看| 亚洲福利电影网| 99精品国产视频| 久久亚洲综合色一区二区三区 | 国产一二三精品| 在线播放亚洲一区| 亚洲欧美国产三级| 丁香婷婷综合激情五月色| 亚洲乱码国产乱码精品精的特点| 激情久久久久久久久久久久久久久久| 欧美日韩国产综合久久| 亚洲人被黑人高潮完整版|