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.
2017届高考英语一轮复习夯实训练:Unit 9《Wheels》(北师大版含解析)
2017届高考英语一轮复习夯实训练:Unit 24《Society》(北师大版含解析)
2017届高考英语一轮复习夯实训练:Unit 22《Environmental Protection》(北师大版含解析)
2017届高考英语一轮复习夯实练习:必修3U2《Healthy eating》(新人教版含解析)
2017届高考英语一轮复习夯实训练:Unit 21《Human Biology》(北师大版含解析)
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2017届高考英语一轮复习话题复习课件:模块必修4 话题17 农业技术(新人教版必修模块)
2017届高考英语一轮复习夯实训练:Unit 20《New Frontiers》(北师大版含解析)
2017届高考英语一轮复习夯实训练:Unit 8《Adventure》(北师大版含解析)
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2017届(浙江、江苏)高考英语一轮复习题型重组训练:第1组(牛津译林版含解析)
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2017届高考英语一轮复习夯实训练:Unit 7《The sea》(北师大版含解析)
2017届高考英语一轮复习夯实训练:Unit 16《Stories》(北师大版含解析)
2017届(浙江、江苏)高考英语一轮复习题型重组训练:第4组(牛津译林版含解析)
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2017届高考英语一轮复习夯实训练:Unit 19《Language》(北师大版含解析)
2017届高考英语一轮复习夯实训练:Unit 17《Laughter》(北师大版含解析)
2017届高考英语一轮复习话题复习课件:模块必修4 话题18 语言幽默(新人教版必修模块)
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