BEIJING, Aug. 21 -- Beijing Monday reported the lowest record for a major air pollution indicator for January-July period since 2013.
The PM2.5 density averaged 64 micrograms per cubic meter in the first seven months of 2017, down 34.7 percent from the same period in 2013, according to Beijing Environmental Protection Bureau.
PM2.5 density measures the concentration of small, breathable particles in the air and is often used as a gauge for smog.
Smog has become a frequent occurrence in north China in recent years, particularly in winter, due to the high concentration of industry, excessive use of coal, climate change and the explosive growth of private vehicles among other reasons.
Beijing has been one of the cities which suffered the most from smog.
The government said PM2.5 levels have been lowered as the city progresses in its 2017 "clean air" targets of replacing coal with clean energy in 4,000 furnaces, removing 300,000 polluting vehicles from roads, and relocating 500 rudimentary manufacturers.
Beijing aims to lower its PM2.5 yearly average from 73 micrograms per cubic meter in 2016 to 60 in 2017. It will be a challenging target as PM2.5 usually increases in winter when the atmosphere is more static and households turn on coal-burning heaters.
新版gre写作新题库:argument147
新GRE写作Issue亮点句
新版gre写作新题库:argument140
新版gre写作新题库:argument174
2012年GRE issue写作优秀实例:重视认知和推理能力
GRE写作:Issue主题范文及评析2
GRE写作:巧用小词拿高分
新GRE写作中例子的使用方法
新版gre写作新题库:argument169
新GRE写作优秀范文:技术与学习的矛盾
可插入GRE作文提升含金量的精致名言
从提高实力角度谈提高GRE写作水平
新版gre写作新题库:argument170
GRE作文2012高分要素:避免语言偏见
十个给力句式帮你丰富GRE写作
新版gre写作新题库:argument146
GRE写作:Issue主题范文及评析4
GRE写作雷同作文问题详解
作文重判成功经验分享
新版gre写作新题库:argument171
新GRE写作高分关键:提纲+逻辑
新GRE写作:掌握正确方法是王道
GRE写作:Issue主题范文及评析3
GRE填空:对立关系类解法之关键词剖析
GRE写作满分经验分享:文风淳朴思路广
新GRE写作题目解析4方法
新GRE作文个人类句子短语总结
GRE写作:Issue主题范文及评析1
提纲:帮你理清GRE写作思路
新GRE考试作文评分标准
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |