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杭州市空气污染死亡终点环境损害成本估算
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摘要
随着社会经济的迅速发展,人口的急剧增多,人类在生产和生活过程中促进社会经济的发展、物质生活的丰富和生活福利的提高,同时对环境产生负面影响造成严重的环境污染,并为此付出了巨大的环境成本。大气污染已经成为城市发展中一个不可忽视的环境问题之一,是全世界城市居民生活中一个无法逃避的现实。大气污染的危害是多方面的,特别是对人群健康的影响,造成巨大的经济损失,日益受到人们的重视。对大气污染的危害进行健康损害成本估算,可以从货币的角度反映大气污染对人群健康的影响与危害程度。
     本论文在已明确的空气污染对人体健康影响的条件下,选取死亡健康终点为研究对象,采用已在西方发达国家广泛应用的意愿调查价值评估法,调查杭州市居民对改善环境空气质量,降低环境空气污染健康风险的支付意愿,并结合本课题组已往研究的杭州市空气污染人年损失数的成果,计算出杭州市居民统计学意义上的生命价值(value of statistics life,VOSL),结合不同污染物不同污染源导致的死亡人数,进行环境成本转化,最终确定杭州市空气污染的人群死亡终点健康损害成本。然后,将研究结果与国内外已有报道的其他成果进行比较,纵向分析了不同因素对支付意愿的影响效果,同时验证了本研究的准确性。取得的主要成果如下:
     (1)调查结果统计表明,有83.26%的被调查者愿意为降低大气环境污染人群健康风险支付一定费用,其支付意愿值为每年76.3元,大气污染死亡健康风险相关WPT货币化值(即VOSL)为221.8万元。
     (2)根据2004年杭州市由于空气污染导致的人群死亡数量计算结果,计算得2004年杭州市空气污染死亡健康终点的环境损害成本为1,350,110.8万元,占这年GDP总量的5.37%。
     (3)不同大气污染源导致的死亡终点损害成本的比重:工业废气排放是造成人体健康环境损害的主要原因,为1,291,319.6万元,占到总成本的95.65%;其次是机动车尾气,为51,679.4万元,占总成本的3.83%;比重最小的是服务业,有7,097.6万元,占总成本的0.53%。
     (4)不同污染物的死亡终点损害成本比重分布:对人群健康的影响最大的是PM_(10),造成的死亡终点健康损害成本为1,099,019.0万元,占总成本的83.72%,其中慢性死亡环境成本是主要的,占97.22%;其次是NO_X的环境成本,为116,445.0万元,占总成本为8.62%;SO_2的环境成本稍低于NO_X,为103,358.8万元,占总成本的7.66%。
     (5)不管是在单个研究内部还是与同类研究的统计结果均表明,收入对支付意愿呈正相关性,即收入越高支付意愿值越大,是最大影响因素,其它各因素如家庭规模、年龄、文化程度等都有较大的影响,但是其规律性还有待进一步研究。
Along with the rapid development of social economy, rapid increase of population, improvement of material life and rising of welfare in their production and life course, meanwhile, they also have given rise to negative influence on environment and have paid for the huge environment cost for the serious pollution. Air pollution has become one of the most series problems that cannot be ignored for cities all around the world. The adverse effects resulted from air pollution are comprehensive. The damage to human health attracts specially attention because of its huge economic cost. Evaluating the air pollutants human health costs can quantify the damage human beings suffered from air pollution monetary.
     After studied the adverse effects detailed, death end point of air pollution was chosen as research object. Adopting the CVM which has been widely used in western countries, the willingness to pay for improving air quality and reducing the health risk from air pollution of citizens in Hangzhou were investigated. Meanwhile, it also calculated the VOSL of citizens in Hangzhou with reference to our former research in YLL caused by air pollution in Hangzhou, and conducted environmental costs according to the loss number of lives caused by different pollutants and different pollutant sources, and finally determinants of amount of WTP conditional were discussed. By comparing the results of the research with reported conclusions drawn by others both at home and abroad, it analyzed the effects of different factors on the willingness to pay, and at the same time checks the accuracy of this research. The main achievements were as follows:
     Firstly, 83.26% of the all 684 informants was willing to pay certain outlay to improve the environment and meliorate their living condition. Their WTP was 76.3RMB per year. So, the VOSL of the death risk reduction of air pollution in Hangzhou was 22.18 million RMB.
     Secondly, the total environmental cost of air pollution death end point was 13.50 billion RMB in 2004, accounting for 5.37% of the GDP of the city.
     Thirdly, industrial emission whose environmental cost reached 12.91 billion RMB was still the main cause of human health damage from air pollution, accounting for 95.65% of the total environmental cost. The next was vehicle emission, about 5,167.94 million RMB, accounting for 3.83%. The last was the services, about 709.76 million RMB, accounting for only 0.53%.
     Fourthly, PM_(10) was the primary air pollutant that harms human health among the three main air pollutants. Its environment cost was 10.99 billion RMB, accounting for 83.72% of the total environmental cost. The next was NO_X whose contribution was 11,644.5 million RMB. The last was the SO_2, accounting for 7.66% of the total environmental cost.
     Fifthly, iacome display positive relationships with WTP not only among the informants in a same investigation or investigations organized in different areas, which means higher income people were more willing to contribute for air pollution reduction. Other factors such as family size, age and education also had great influence on WTP. However, their disciplinarian needs to be proved in the future research.
引文
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