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The author:(作者)delvpublished in(发表于) 2014/1/2 8:34:07 Beijing last year for every 6-7 days 1 through heavy pollution during
Xinhuanet, Beijing, January 2 (reporter Ni Yuanjin)-Director Zhang Dawei, Beijing environment monitoring Center said on a press conference held on 2nd, 2013 Beijing 5, level 6 "heavy pollution days" a total of 58 days, 15.9% per cent for the year. "This shows that on average once every 6-7 days is heavily polluted. ”
2013 was officially launched in Beijing year one of PM2.5 monitoring, implementation of air quality "new standard" in the first year. Beijing environmental protection Bureau said that 2013 89.5 mg/cubic metres of annual average PM2.5 concentrations for the year for the "new national standard of" 2.56 times times the 35 mg/m, achieved in 2017, with an average annual concentration under 60 mg/m or so to go.
Zhang Dawei, Director of Beijing Municipal Environment Monitoring Center said that Beijing PM2.5 appears to "South High North", Southeast and southwest border areas of highest concentration in the city, and its concentration in urban area as a whole for the high-value area of southern and Northern regions as a whole is better. He stressed that the vehicle exhaust contribute to PM2.5 concentrations significantly, 5 layout in the loop "traffic monitoring sub-station" mean PM2.5 concentrations higher than the citywide average of 15%.
It is understood that, as one of the key areas of urban Beijing, began on January 1, 2013, the first implementation of the ambient air quality standards (GB3095-2012). The new national standard requires continuous monitoring of the 6 pollutants, including old standards for sulphur dioxide, nitrogen dioxide, PM10, and PM2.5, ozone, new carbon monoxide. Which PM2.5 using who first phase target value, or 35 mg/m.
Atmospheric environmental management branch of Beijing municipal environmental protection Bureau Director Yu Jianhua said, "the new national standard of" stringent concentration limit values for PM10 and other pollutants in the old standard, "in the case of relative air quality remains unchanged, ruler of the evaluation, number of days and heavy pollution occurred at all levels will be more significant changes in 2012 and before."
Dawei Zhang introduced, based on the "new national standard" 6 pollutants monitoring data in 2013 Beijing 1, level 2, "good days" a total of 176 days, 48.2%;5, 6 per cent for the year of "heavy pollution days" a total of 58 days, 15.9% per cent for the year.
3 lightly polluted in Beijing over "excessive pollution day", the first major pollutants is PM2.5, 77.8%, followed by ozone, and 20.1% other pollutants of primary pollutants only accounted for 2.1%.
"Noteworthy is that all the air quality of grade 5 or grade 6 ' heavy pollution days ', the first is PM2.5 pollutants. In addition as regards PM2.5 annual PM2.5 is the primary or secondary level standard 204 days, compliance with 55.9%. "Zhang Dawei said.
Provided by the Beijing municipal environmental protection Bureau "monthly air quality levels, 2013-days" color Atlas bar, "according to heavily polluted days" occur in the first quarter. Since autumn, cool air pollutant dispersion visit helps, 9 1, 2 "good days" for 73 days, 59.8% per cent over the same period.
It is understood that in 2013 to cut coal-fired Beijing, 1.3 million tons of updates out of old motor vehicles more than 350,000 vehicles, adjusted exit 288 enterprises, a reduction of pollution emissions of volatile organic compounds of 8,300 tons, will continue cutting coal oil, industrial optimization, limit car control, dust control and other pollution reduction projects.
新华网北京1月2日电(记者倪元锦)北京市环境监测中心主任张大伟在2日举行的发布会上说，2013年北京5、6级“重污染天数”累计58天，全年占比15.9%。“这说明，平均每6至7天就是一次重污染过程。”
2013年是北京市正式开展PM2.5监测的元年，也是执行环境空气质量“新国标”的第一年。北京市环保局称，2013年全年PM2.5年均浓度为89.5微克／立方米，为“新国标”35微克／立方米的2.56倍，实现2017年年均浓度控制在60微克／立方米左右任重道远。
北京市环境监测中心主任张大伟指出，北京PM2.5整体呈现“南高北低”，东南和西南边界地区的浓度水平为全市最高，南部和市区整体为浓度次高值区，北部地区整体较好。他强调，机动车尾气对PM2.5浓度贡献明显，5个布局在环路的“交通监测子站”的PM2.5浓度均值比全市平均水平高出15%。
据了解，北京市作为重点地区城市之一，于2013年1月1日首批开始实施《环境空气质量标准(GB3095—2012)》。这项新国标规定对6项污染物进行连续监测，包括老标准的二氧化硫、二氧化氮、PM10和新增的PM2.5、臭氧、一氧化碳。其中，PM2.5采用世界卫生组织第一阶段目标值，即35微克／立方米。
北京市环保局大气环境管理处处长于建华说，“新国标”收紧了旧标准中PM10等污染物的浓度限值，“在相对空气质量不变的情况下，评价的尺子变了，各级别天数和重污染发生次数，会较2012年及以前有明显变化”。
张大伟介绍，基于“新国标”中6项污染物监测数据，2013年北京1、2级“优良天数”累计176天，全年占比48.2%；5、6级“重污染天数”累计58天，全年占比15.9%。
在北京3级轻度污染以上的“超标污染日”中，首要污染物主要是PM2.5，占77.8%；其次为臭氧，占20.1%；其他污染物成为首要污染物的比例仅占2.1%。
“值得注意的是，所有空气质量为5级或6级的‘重污染天数’中，首要污染物都是PM2.5。此外单就PM2.5而言，全年PM2.5为一级或二级水平的达标天数占204天，达标率55.9%。”张大伟说。
北京市环保局提供的“2013年各月空气质量各级别天数”条形彩色图谱显示，“重污染天”多发生在一季度。入秋以来，冷空气造访有助于污染物扩散，9至12月份的1、2级“优良天数”达73天，同期占比59.8%。
据了解，北京市在2013年共削减燃煤130万吨、更新淘汰老旧机动车超35万辆、调整退出污染企业288家、削减挥发性有机物排放8300吨，未来将继续推进压减燃煤、限车控油、产业优化、扬尘治理等污染减排工程。
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