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北京遇史上最长重污染橙警 这些释疑戳中要害!

2017-01-06 18:11:36   千龙网

清华大学教授王书肖介绍:京津冀区域正处在工业化和后工业化过程叠加的时期,燃煤、工业、机动车和居民生活排放量都处于高位,大气污染防治任务还很艰巨。目前京津冀区域的污染治理处于第二阶段,即污染的发生发展受自然边界条件的影响显著,比如风速、湿度、边界层高度等这些气象条件的影响。特别是在冬季采暖期间污染物排放强度大的情况下,这个表现就更加突出,一旦气象条件不利,就可能形成重污染。

但京津冀本地污染物排放强度大,还是重污染天气高发的根本原因,必须坚持不懈地扎实推进污染物减排工作。

“机动车无害”说

北京工业大学教授程水源解答:根据北京市大气PM2.5污染源解析结果,PM2.5本地污染源贡献中机动车排放占31.1%,燃煤占22.4%,工业生产占18.1%,扬尘占14.3%。可以看到在本地污染源中,机动车排放的占比最高,因此北京市重点控制机动车污染是十分必要的。

但控制机动车排放仅仅是治理空气污染的一个环节,北京市在治理大气污染方面还实施了很多其它重要措施,包括大力压减燃煤、民用散煤清洁化、燃煤小锅炉和“散小乱污”企业的淘汰治理、建筑施工扬尘管控等。

“何时见蓝天”说

何时北京蓝天会重来?这个问题小编也想问。

2015年7月31日,北京在申办2022年冬奥会投票表决前承诺,到2022年北京的雾霾问题一定会解决,距离这个承诺的实现还有5年的时间。

北京抗霾不努力么?北京在减排和治理雾霾上面,的确下了不少功夫,愈发严苛的机动车管理限行措施;全城范围大面积关停污染及高排放企业;大力度推行采暖“无煤化”,可以说能用的招数都用了。

2016年12月的公开数据显示,2013年以来,北京累计关停退出一般制造业企业1341家。北京四大热力电厂如今仅剩华能北京热电厂燃煤机组。自2001年起截至2015年,全市煤改电用户总数已达到38.45万户。其中,北京市核心区基本实现取暖无煤化。

此外,1月3日北京市环保局发布的2016年空气质量状况显示,2016年北京PM2.5年均浓度73微克/立方米,同比降9.9%。2016年空气重污染天数比2015年减少7天。

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