نتایج جستجو برای: and nitrogen dioxide no2 into the air pollution standard index in 1997

تعداد نتایج: 24206134  

2016
Guo-Zhen Lin Li Li Yun-Feng Song Ying-Xue Zhou Shuang-Quan Shen Chun-Quan Ou

BACKGROUND Preventing suicide is a global imperative. Although the effects of social and individual risk factors of suicide have been widely investigated, evidence of environmental effects of exposure to air pollution is scarce. We investigated the effects of ambient air pollution on suicide mortality in Guangzhou, China during 2003-2012. METHODS A conditional logistic regression analysis wit...

Journal: :Pediatrics 2005
Mei Lin David M Stieb Yue Chen

OBJECTIVES The purpose of this study was to examine the association between ambient air pollution and hospitalization for respiratory infections among children who were younger than 15 years in Toronto during a 4-year period (1998-2001). METHODS Exposures averaged during periods that varied from 1 to 7 days were used to assess the effects of air pollutants, including thoracic particulate matt...

2015
R W Atkinson I M Carey A J Kent T P van Staa H R Anderson D G Cook

OBJECTIVES The role of outdoor air pollution in the incidence of chronic obstructive pulmonary disease (COPD) remains unclear. We investigated this question using a large, nationally representative cohort based on primary care records linked to hospital admissions. METHODS A cohort of 812 063 patients aged 40-89 years registered with 205 English general practices in 2002 without a COPD diagno...

Journal: :International journal of occupational medicine and environmental health 2015
Mieczyslaw Szyszkowicz

OBJECTIVES The objective of this study was to present a technique for estimating the effect of ambient air pollution mix on health outcomes. MATERIAL AND METHODS We created a technique of indexing air pollution mix as a cause of the increased odds of health problems. As an illustrative example, we analyzed the impact of pollution on the frequency of emergency department (ED) visits due to col...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ولی عصر (عج) - رفسنجان - دانشکده ریاضی 1389

in this thesis, first the notion of weak mutual associativity (w.m.a.) and the necessary and sufficient condition for a $(l,gamma)$-associated hypersemigroup $(h, ast)$ derived from some family of $lesssim$-preordered semigroups to be a hypergroup, are given. second, by proving the fact that the concrete categories, semihypergroups and hypergroups have not free objects we will introduce t...

2014
Ibrahem A.A. Almohisen

the study was aimed to investigate the change of some fatty acids to ambient air pollution in four legumes species Pisum sativum L. and (Vicia faba L.m and during summer season were Glycine max and Vigna sinensis grown in five sites mostly affected by high traffic intensity and or industrial activities in Riyadh city capital of Saudi Arabia. The results showed increasing of air pollution (O3, N...

2012
Mark D. Gibson Mathew R. Heal Zhengyan Li James Kuchta Gavin H. King Alex Hayes Sheldon Lambert

Over 200,000 tourists per year visit Cape Breton Highlands National Park, Nova Scotia, Canada. The forests within the park are home to many rare epiphytic lichens, the species diversity of which has declined in some areas. The primary motivation for this study was to gain insight into the concentrations and potential local and long-range sources of air pollution, but its association with lichen...

2015
Katja VINTAR MALLY Matej OGRIN Katja Vintar Mally

Ambient nitrogen dioxide (NO2) concentrations are regularly measured at only two monitoring stations in the city centre of Ljubljana, and such scanty data are inadequate for drawing conclusions about spatial patterns of pollution within the city, or to decide on effective measures to further improve air quality. In order to determine the spatial distribution of NO2 concentrations in different t...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تهران - دانشکده علوم 1357

in his last years of life americans had almost forgotton steinbeck, and those who had not, occasionally criticized him for supporting and praising the u. s. military intervention in the vietnam war. althought ateinbeck incorporates different themes into his works, each one bears many signs of his concern and sympathy for america and the american common people in particular. steinbecks to a god ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس 1389

abstract: country’s fiber optic network, as one of the most important communication infrastructures, is of high importance; therefore, ensuring security of the network and its data is essential. no remarkable research has been done on assessing security of the country’s fiber optic network. besides, according to an official statistics released by ertebatat zirsakht company, unwanted disconnec...

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