The Ministry of environmental protection: 338 cities PM2.5 exceeded last year _ 42.9% |PM2.5| air quality news
Original title: governance solutions | 338 cities last year PM2.5 exceeded what 42.9% means?
Beijing News Alerts (by Deng Qi) this morning, Chen Jining to the national people's Congress, Minister of environmental protection of the State Council on 2015-State of the environment and environmental protection target completion of the report, said national 338 last year and above the city, fine particulate matter (PM2.5) annual average concentration of 50 μg/m3, Standard 42.9%.
Why does it only cover 338 cities? it is learnt that in 2012, the new air quality standards issued, increased PM2.5 monitored values. For the new air quality monitoring requirements, the Environmental Protection Department will implement new standards for monitoring into "three-step", and specific monitoring programmes were released in three stages.
First stage in Beijing, Tianjin and Hebei, Yangtze River Delta, Pearl River Delta and other key areas as well as municipalities and provincial capitals and municipalities (74), undertake new specific monitoring of PM2.5, ozone, carbon monoxide, and other projects. Subsequently, the second phase of increased environmental protection in key cities, model city, win over the city, including Datong, Sanya. Third stage in all but the first to second phase of city level and above city, including 177 and above the city, a total of 552 State-controlled city air quality monitoring sites.
After three stages of construction, from January 1, 2015, 338 total 1436 monitoring sites of the city level and above, all new standards for air quality monitoring.
Annual average PM2.5 concentrations of 50 μg/m3, Standard 42.9%, meaning what? according to the latest air quality standards, the annual average, refers to a calendar year as the arithmetic average of the daily average concentration value. PM2.5 annual average concentration limit of 15 micrograms per cubic meter at the national level, the secondary concentration limit is 35 micrograms per cubic meter. Which level concentration limits applicable to a class of area (nature reserves, scenic spots and other areas that need special protection); secondary concentration limits applicable to category II areas (residents of residential areas, commercial traffic mix, cultural areas, industrial areas and in rural areas).
Excessive 42.9%, contrast is GB secondary concentration limit of 35 micrograms per cubic meter. A case study of Beijing, Beijing last year 80.6 mg/cubic metres of annual average PM2.5 concentrations, exceeding the national standard of 35 mg/m 130%. Plus, even if Beijing's "Thirteen-Five" annual average PM2.5 concentrations lower than in 2015 target of 15%, does not meet national standards.
Environmental protection experts, ambient air quality criteria is based on factors such as air quality effects on human health and development, exceeded national standards the more, the greater the impact on human health. However, reaching the national standard does not mean that no impact on human health, but more reduced. He said the period value of national standards, associated with the stage of economic and social development.
Beijing environmental protection Bureau said that Beijing is currently developing long-term environmental protection by 2030 plan, expected to be completed late this year or early next year to develop. Around the year 2030, annual average PM2.5 concentrations in Beijing should be able to achieve the national standard of 35 micrograms per cubic meter.
Responsible editor: Zheng Hanxing
Article keywords:PM2.5 air quality
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环保部：去年338个城市PM2.5超标42.9% |pm2.5|空气质量_新闻资讯
原标题：政解｜去年338个城市PM2.5超标42.9%意味着什么?
新京报快讯 (记者邓琦)今天上午，环保部部长陈吉宁向全国人大常委会作《国务院关于2015年度环境状况和环境保护目标完成情况的报告》时表示，去年全国338个地级及以上城市，细颗粒物(PM2.5)年均浓度50微克/立方米，超标42.9%。
为何只覆盖338个城市?据悉，2012年，环境空气质量新标准发布，增加了PM2.5监测值。针对全新的空气质量监测要求，环保部将实施新标准监测分为“三步走”，并针对三个阶段发布了具体的监测方案。
第一阶段即在京津冀、长三角、珠三角等重点区域以及直辖市和省会城市和计划单列市(74个)中，开展针对新增指标PM2.5、一氧化碳、臭氧等项目的监测。随后，第二阶段增加了国家环保重点城市、模范城市在内的共百余个城市，包括大同、三亚等。第三阶段即在除第一、二阶段已实施城市以外的所有地级及以上城市，包括177个地级及以上城市，共552个国控城市空气质量监测点位。
经过三个阶段的建设，从2015年1月1日起，全国338个地级及以上城市共1436个监测点位，全部开展空气质量新标准监测。
PM2.5年均浓度50微克/立方米、超标42.9%，意味着什么?根据环境空气质量最新标准，年平均值，指一个日历年内各日平均浓度的算术平均值。针对PM2.5年平均值，国家一级浓度限值为15微克/立方米，二级浓度限值为35微克/立方米。其中，一级浓度限值适用于一类区(自然保护区、风景名胜区和其他需要特殊保护的区域);二级浓度限值适用于二类区(居住区、商业交通居民混合区、文化区、工业区和农村地区)。
超标42.9%，对比的即是国标中二级浓度限值35微克/立方米。以北京为例，北京去年PM2.5年均浓度为80.6微克/立方米，超过国标35微克/立方米130%。另外，就算北京“十三五”时期达到PM2.5年均浓度比2015年下降15%的目标，仍不能达到国家标准。
环保专家介绍，环境空气质量标准，是基于空气质量对人体健康影响等因素考虑而制定的，超过国家标准越多，对人体健康的影响就越大。不过，达到了国标也不意味着对人体健康没有影响，只是影响更为降低。他表示，国家标准的阶段值，跟经济社会发展的阶段相关。
北京市环保局曾表示，北京目前正在制定到2030年的远期环保规划，预计今年底或明年初制定完成。到2030年左右，北京PM2.5年均浓度应该能达到35微克/立方米的国家标准值。
责任编辑：郑汉星
文章关键词： pm2.5 空气质量
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