Haze in China has been increasing in frequency of occurrence as well as the area of the affected region. Here, we report on a new mechanism of haze formation, in which coexistence with NOx can reduce the environmental capacity for SO2, leading to rapid conversion of SO2 to sulfate because NO2 and SO2 have a synergistic effect when they react on the surface of mineral dust. Monitoring data from ...

Title of Document: AIR POLLUTANT CONCENTRATIONS AND TRENDS OVER THE EASTERN U.S. AND CHINA: AIRCRAFT MEASUREMENTS AND NUMERICAL SIMULATIONS Hao He, Doctor of Philosophy, 2012 Directed By: Professor Russell R. Dickerson Department of Atmospheric and Oceanic Science In the last several decades, efforts have been made to mitigate air pollution all around the world. With surface observations showin...

An understanding of the complexity of spatial-temporal variations in regional air quality and its respective source contributors is one of the priority research areas due to the adverse effects of air pollution on human health and the environment. In this paper, we integrate air dispersion modeling and Geographic Information System (GIS) based spatial analysis methods to characterize regional a...

This study investigates the efficiency of pollution permit markets by conducting an empirical study of the U.S. SO2 market. A hedonic model of coal price is estimated by using the coal price data from 1985 to 1998. The estimation results showed that the sulfur premium was in the same order as the SO2 allowance prices in the EPA auction. In addition, for 1997 and 1998, the SO2 allowance prices w...

BACKGROUND Cardiac arrhythmias are cardiac rhythm disorders that comprise an important public health problem. Few prior studies have examined the association between ambient air pollution and arrhythmias in general populations in mainland China. METHODS We performed a time-series analysis to investigate the short-term association between air pollution (particulate matter with an aerodynamic d...

objective: there are many communities at risk by a series of air pollution episodes. tehran is one of the most polluted cities in the world. the presence of one or more air pollutants with a certain concentration in a particular period of time can cause several adverse effects on human and animals’ well-being that can cause much morbidity. there are several pollutants in the air but some of the...

Problem statement: The reduction in ambient air pollution is a universal goal-particularly in urban areas, the lack of resources often necessitates identification and prioritization of sources of air pollutants. Efficient planning and effective management of environmental pollutants is thus important for optimum utilization of limited resources. Approach: This study examined seven years of data...

A study was set up to investigate the effects of annual changes in the levels of atmospheric smoke and SO2 on changes in health from 1973 to 1977 in primary schoolchildren from 28 randomly selected areas of England and Scotland. Changes in health were measured by taking the change in number of respiratory conditions reported from one annual examination to the next. The number of areas with dat...

There is controversy as to whether low levels of air pollution affect the symptoms and lung function in asthma. We addressed this by examining the short-term effects of winter air pollution on childhood asthma in Paris. We performed a 6 month follow-up of 84 medically diagnosed asthmatic children classified into two groups of severity. The outcomes included incidence and prevalence of asthma at...

SCR and FGD are making a significant contribution to the control of NOx and SO2 emissions from coal-fired generating units. These technologies are expected to contribute to further reductions in pollutant emissions in response to proposed emission reduction rules. The ability of these technologies to make significant contributions to pollution reduction in a cost-effective manner depends, in pa...