国产热热热精品,亚洲视频久久】日韩,三级婷婷在线久久,99人妻精品视频,精品九热人人肉肉在线,AV东京热一区二区,91po在线视频观看,久久激情宗合,青青草黄色手机视频

USEUROPEAFRICAASIA 中文雙語Fran?ais
Lifestyle
Home / Lifestyle / Health

Living with smog

By Liu Zhihua | China Daily | Updated: 2014-03-19 07:39

The material, structure and the method of wearing a mask are important, according to Li Guimei, the secretary-general of China Nonwovens and Industrial Textiles

Living with smog

China's teachers count most 'zzz's 

Living with smog

Good sleep may boost brain function: Study 

Association.

Ordinary cotton face masks are not designed to trap PM2.5, even though they can block large particles, says Li at an air-pollution protection forum held in Beijing in February.

Besides, as the domestic mask market is still developing, there is no nationwide official criteria and regulation on the categorization and use of different masks. As a result, many of the mask sellers claim their products are able to protect people from PM2.5. But they are made of materials that do not block PM2.5, or do not fit and seal the nostril and mouth areas, Li says.

Masks made of special materials - not just cotton - that have been confirmed to be able to block PM2.5, seal around the face tightly and do not have very big respiratory resistance are the best, Li adds.

As for air purifiers, sales increase in pace with growing awareness of PM2.5, but consumers may become confused on how to choose among so many brands and types, especially when there is no official criteria and testing method on an air purifier's ability to remove PM2.5 in the air, according to Wu Jixiang, an expert with Shanghai Jiaotong University.

A non-governmental consumer-rights protection organization in Shanghai reported in 2013 that almost all the air purifiers it tested exaggerated their ability to remove PM2.5, Wu adds.

Wu suggests customers seek advice from trustworthy professionals when choosing an air purifier, or use a hand-held PM2.5 measuring device to measure the efficiency of the machine. It is also important to follow the instruction of the user's guide to make good use of an air purifier, Wu adds.

Xu Qiong, the Beijing resident, says depending on masks and air purifiers to protect against air pollution are not long-term solutions. Instead, the government should take efficient action to clean the air as soon as possible.

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
永仁县| 临清市| 西平县| 陆丰市| 岳阳县| 泰和县| 敖汉旗| 山阳县| 株洲市| 扎兰屯市| 淮安市| 社会| 潼关县| 齐河县| 焉耆| 府谷县| 望城县| 多伦县| 通江县| 定远县| 奎屯市| 庆元县| 正宁县| 界首市| 仁布县| 饶河县| 南川市| 曲周县| 峡江县| 铜川市| 岢岚县| 汉川市| 同仁县| 汾阳市| 张家界市| 玛纳斯县| 云和县| 长沙县| 万山特区| 河西区| 安图县|