新闻 > 国内
404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China

媒体六问雾霾:京津冀污染源真的是蒙陕晋吗?

2016-12-21 05:53:57   新京报

重霾来袭,截至12月20日9时,中东部82个城市出现重度及以上污染,京津冀及周边区域24城市出现了小时浓度“爆表”。北京也在20日陷入6级严重污染。京津冀的污染源来自哪里、抗霾是否只能靠风、空气治理究竟有没有起到作用……针对社会公众对于重污染天气存在的一些疑问,多位专家对此进行了解答。

昨日,建国路,国贸地区诸多高楼被笼罩在雾霾中。新京报记者 浦峰 摄

1京津冀雾霾,蒙陕晋是主要污染源?

中国环境科学研究院研究员柴发合表示,大量的观测分析和模式研究都表明,京津冀大气重污染主要是本地积累加上外地传输导致的。其中,京津冀三地自身的排放量大是最主要的因素,对PM2.5污染的贡献约为70%左右。周边省市的区域传输对京津冀PM2.5污染的贡献约占30%左右,其中影响最大的是山东、河南两省的污染排放。此外,山西、内蒙古和陕西的排放对京津冀PM2.5污染也有一定的贡献,但不是污染的主要原因。

柴发合说,京津冀区域国土面积虽然只占全国的2%,但2014年常住人口占全国的8%,煤炭消费占全国的9.2%,单位面积SO2、NOX、烟粉尘排放量分别约为全国平均水平的3倍、4倍和5倍。在冬季采暖期间,京津冀本地污染物排放强度进一步加大,是重污染天气高发的根本原因,一旦气象条件不利,就可能形成重污染。

2“煤改气”加剧北京雾霾污染?

中科院大气物理所研究员王自发介绍,按照我国当前的天然气消耗量计算,假如全部转化成液态水,平摊在全国人口集中的东部地区,厚度连0.1毫米/年都不到,仅占大气中可降水量的几十万分之一,影响微乎其微。所以说,“煤改气”不会显著增加北京市大气中的湿度,不是北京地区“丰富水汽”主要来源。

南开大学教授冯银厂表示,无论是燃煤、燃气还是燃油,都会排放氮氧化物。“煤改气”是否会导致氮氧化物的升高,主要取决于改气之前煤炭的燃烧方式和煤炭品质、改气之后采取的燃烧技术等因素。如果采用了低氮燃烧技术,氮氧化物的排放量就会降低。

他说,我国脱硝比脱硫的起步晚,近年来大气环境中的氮氧化物浓度下降并不像二氧化硫那么显著。氮氧化物浓度的增加可能会造成二次污染,但这是可控的。而且污染成因和机理非常复杂,不能因为氮氧化物浓度没有明显下降,颗粒物污染依然严重,就说是煤改气造成的,这是不科学的。

上一页1/2下一页
404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China
404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China

相关阅读

雾霾锁城快递被堵 延误几天到货老天爷担责么?(图)

2016-12-21 05:18:40

幼儿园学生停课画雾霾:都是灰的 不能用彩笔了(图)

2016-12-21 04:57:19

河南安阳一学校400多名学生雾霾天在操场考试(图)

2016-12-21 04:43:31

冷风已经在路上! 今夜起风雨将驱散多日雾霾

2016-12-21 04:04:57
404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China
404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China
分享到:
0 0
404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China
404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China

美图推荐

404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China
404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China
404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China
404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China

为您推荐

加载更多>>
404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China
404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China
404 Not Found

404 Not Found

Sorry for the inconvenience.
Please report this message and include the following information to us.
Thank you very much!

URL: http://3g.china.com:8080/act/news/945/20161221/30097619.html
Server: cms-9-53
Date: 2024/11/28 09:05:45

Powered by China
China