AIR POLLUTION (2nd ed.)
01 Mar 1970-American Journal of Public Health (American Public Health Association)-Vol. 60, Iss: 3, pp 587-588
About: This article is published in American Journal of Public Health.The article was published on 1970-03-01. It has received 80 citations till now. The article focuses on the topics: Air pollution.
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TL;DR: In this article, a semiparametric approach is proposed to analyze air pollution data and reveal complex extremal dependence behavior that is consistent with scientific understanding of the process. But it is not suitable for applications where the extreme values of all the variables are unlikely to occur together or when interest is in regions of the support of the joint distribution where only a subset of components is extreme.
Abstract: Summary. Multivariate extreme value theory and methods concern the characterization, estimation and extrapolation of the joint tail of the distribution of a d-dimensional random variable. Existing approaches are based on limiting arguments in which all components of the variable become large at the same rate. This limit approach is inappropriate when the extreme values of all the variables are unlikely to occur together or when interest is in regions of the support of the joint distribution where only a subset of components is extreme. In practice this restricts existing methods to applications where d is typically 2 or 3. Under an assumption about the asymptotic form of the joint distribution of a d-dimensional random variable conditional on its having an extreme component, we develop an entirely new semiparametric approach which overcomes these existing restrictions and can be applied to problems of any dimension. We demonstrate the performance of our approach and its advantages over existing methods by using theoretical examples and simulation studies. The approach is used to analyse air pollution data and reveals complex extremal dependence behaviour that is consistent with scientific understanding of the process. We find that the dependence structure exhibits marked seasonality, with ex- tremal dependence between some pollutants being significantly greater than the dependence at non-extreme levels.
588 citations
TL;DR: The study uses data collected during a seven-year period (2009–2015) in the automatic measuring station of immissions located in Eastern Wielkopolska to analysis the average and maximum values of air pollution from the perspective of their occurrence in particular seasons and months or in relation to meteorological actors such as temperature, humidity, and wind speed.
Abstract: Seasonal variation of air pollution is associated with variety of seasons and specificity of particular months which form the so-called summer and winter season also known as the “heating” season. The occurrence of higher values of air pollution in different months of a year is associated with the type of climate, and accordingly with different atmospheric conditions in particular months, changing state of weather on a given day, and anthropogenic activity. The appearance of these conditions results in different levels of air pollution characteristic for a given period. The study uses data collected during a seven-year period (2009–2015) in the automatic measuring station of immissions located in Eastern Wielkopolska. The analysis concerns the average and maximum values of air pollution (i.e., particulate matter PM10, sulfur dioxide, nitrogen dioxide, carbon monoxide, and ozone) from the perspective of their occurrence in particular seasons and months or in relation to meteorological actors such as temperature, humidity, and wind speed.
109 citations
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01 Jan 1998
TL;DR: In this article, the authors integrated industrial chemistry with pollution control and environmental chemistry to provide coverage of the key features, relative importance and environmental impact of currently operating chemical processes and considered community, municipal, power generation, industrial and transportation components of environmental impact.
Abstract: Integrates industrial chemistry with pollution control and environmental chemistry to provide coverage of the key features, relative importance and environmental impact of currently operating chemical processes Also considers community, municipal, power generation, industrial and transportation components of environmental impact
105 citations
TL;DR: The three-step method for determining polycyclic aromatic hydrocarbons (PAH) in environmental samples consists of a preliminary separation of PAH by solvent and/or column chromatography, identification by a combination of gas Chromatography with quadrupole mass spectrometry and computer, and measurement by computerized gas chromatography using internal standards.
91 citations
TL;DR: The ultrastructural changes observed were common to all groups of animals strongly suggesting a concentration-time response of the tissue to NO2.
72 citations