Haze is air pollution in which is mixed up with dust, smoke and other dry particles ,and it obscure the clarity of the sky and interacts with the natural environment.
This kind of air pollutant come from a variety of natural and manmade sources. Natural sources can include windblown dust, and soot from wildfires. Manmade sources can include motor vehicles, and industrial fuel burning, and manufacturing operations. The one of the main cause that touches off haze is manufacturing operations. Many factories were over measure produced the smog that had over the standard and the smog seriously influence the air become air pollution.
The components that make up haze may have negative effect on peoples health especially that of the children and the elderly. Also not excluded are those who have certain diseases such as asthma, allergy, and pneumonia and lung disease. Workers working in the open air have a high risk in their health.
One of effective solutions to help eliminate haze is to make some chemistry changes during the manufacturing process,so it could reduce harmful emissions which are produced by manufacturing operations
2016秋人教精通版英语四上《Fun Time 1》(Recycle 1)ppt课件
2016秋人教精通版英语四上Unit 4《How’s the weather today》(Lesson 24)ppt课件
2016秋人教精通版英语四上Unit 5《I like those shoes》(Lesson 28)ppt课件
2016秋人教精通版英语四上Unit 6《I’m tall》(Lesson 31)ppt课件
2016秋人教精通版英语四上Unit 5《I like those shoes》(Lesson 25)ppt课件1
2014春人教版(精通)英语四下《Unit 1 Welcome to my new home》ppt课件1
2014春人教版(精通)英语四下《Unit 3 What subject do you like best》ppt课件2
2016秋人教精通版英语四上Unit 5《I like those shoes》(Lesson 26)ppt课件1
2014春人教版(精通)英语四下《Unit 2 There are forty students in our class》ppt课件6
2016秋人教精通版英语四上Unit 6《I’m tall》(Lesson 34)ppt课件1
2014春人教版(精通)英语四下《Unit 2 There are forty students in our class》ppt课件4
2016秋人教精通版英语四上《Fun Time 2》(Project)ppt课件
2016秋人教精通版英语四上Unit 4《How’s the weather today》(Lesson 24)ppt课件1
2014春人教版(精通)英语四下《Unit 2 There are forty students in our class》ppt课件
2016秋人教精通版英语四上Unit 6《I’m tall》(Lesson 31)ppt课件1
人教新版英语四下《五个元音字母的发音及练习》PPT课件
2016秋人教精通版英语四上《Fun Time 1》(Recycle 2)ppt课件
2016秋人教精通版英语四上《Fun Time 2》(Part 3)ppt课件
2014春人教版(精通)英语四下《Unit 1 Welcome to my new home》ppt课件5
2014春人教版(精通)英语四下《Unit 1 Welcome to my new home》ppt课件3
2014春人教版(精通)英语四下《Unit 1 Welcome to my new home》ppt课件4
2014春人教版(精通)英语四下《Unit 2 There are forty students in our class》ppt课件1
2014春人教版(精通)英语四下《Unit 3 What subject do you like best》ppt课件1
2016秋人教精通版英语四上Unit 6《I’m tall》(Lesson 35)ppt课件
2014春人教版(精通)英语四下《Unit 3 What subject do you like best》ppt课件3
2016秋人教精通版英语四上Unit 5《I like those shoes》(Lesson 29)ppt课件
2016秋人教精通版英语四上《Fun Time 2》(Part 3)ppt课件1
2016秋人教精通版英语四上Unit 5《I like those shoes》(Lesson 27)ppt课件
2014春人教版(精通)英语四下《Unit 1 Welcome to my new home》ppt课件2
2016秋人教精通版英语四上《Fun Time 1》ppt课件1
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |