共查询到7条相似文献,搜索用时 5 毫秒
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针对成都市大气中颗粒物污染现状,对烟(粉)尘排放的来源,烟(粉)尘排放的重点行业,烟(粉)尘排放的分布地区做了调查,并结合颗粒物污染的分布区域对照分析,提出了相应对策。 相似文献
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Predicting Particulate Matter (PM2.5) Concentrations in the Air of Shahr‐e Ray City,Iran, by Using an Artificial Neural Network 下载免费PDF全文
Gholamreza Asadollahfardi Mahdi Madinejad Shiva Homayoun Aria Vahid Motamadi 《环境质量管理》2016,25(4):71-83
Particulate matter (PM), along with other air pollutants, pose serious hazards to human health. The Artificial Neural Network (ANN) is a branch of artificial intelligence that has an ability to make accurate predictions. In this article, the authors describe such methods and how historical data on air quality, moisture, wind velocity, and temperature in Shahr‐e Ray City, located at the southern tip of Tehran, was used to train an ANN to provide accurate predictions of PM concentrations. The availability of such predictions can offer significant assistance to those who are working to reduce air pollution. 相似文献
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This study examined the spatial distribution of particulate air pollution in the Warri metropolis. This was done to ascertain
the differences between the distribution of particulate matter (PM10) in the urban area and the surrounding rural areas. To
achieve this, the study generated data from field measurement of PM10 levels for the year 2003. Analysis of variance, the
U-test, and simple regression statistical techniques were used to analyze the data. The major finding of the study was that
the Warri metropolitan area is polluted with PM10 levels of over 126 μg/m3, which is 81% over the 70 μg/m3 threshold of the World Health Organization. However the built-up area of the Warri metropolis is 150% more polluted with
PM10 particulates than the surrounding rural areas. While the traffic-clogged area of Enerhen, Jakpa, Deco, and Estate Junctions
are the most polluted areas with levels of 151 μg/m3, traditional areas had the lowest levels of 128 μg/m3. The daily distribution of PM10 showed that Mondays were the most polluted days with levels of 145 μg/m3 and Fridays were the least polluted days with levels of 141.5 μg/m3 in the built-up area, whereas in the rural area Wednesdays were the most polluted days with levels of 57.1 μg/m3 and Sundays were the least polluted days with levels of 53.5 μg/m3. Mondays generally recorded the highest PM10 values because of the large amount of industrial operation, heavy vehicular
traffic in the peak period, and increased commercial activities. The study also showed significant variation in the level
of PM10 particulates within the urban areas of the Warri metropolis with a calculated F-value (3.29), which is greater than the critical F-value of 3.14 at the 0.05 significance level. It is therefore recommended that urban environmental management policy should
be vigorously pursued to curb the adverse consequences of increased PM10 levels in urban areas of the Warri metropolis. 相似文献
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四川省农业环境因素-化肥施用(1998~2007年)宏观动态变化 总被引:1,自引:0,他引:1
化肥的大量施用已成为农村面源污染的一个重要来源,直接影响到农村村镇地表饮用水安全。通过分析四川省1998~2007年化肥施用量、农作物产量和农业劳动力的动态变化特征,发现10年间化肥总用量由205.32万t上升到238.2万t,总体上升16.0%;农作物播种面积由971.44万hm2下降至935.1万hm2,总体下降3.74%;粮食总产量和单产量均呈整体震荡减少,化肥施用相对生产力在下降。综合相关因素,分析认为粮食生产、农产品结构、现代农业生产技术、农业肥料资源和农村劳动力状况,以及城市化发展都是化肥施用量动态变化的主要关联因素。化肥用量上升趋势还将持续一段时间。 相似文献