During the early morning hours on April 29, 2000, a time series of ozone observations from several stations showed that a unique and exceptional ozone episode occurred in Madrid city and surrounding areas, whereby monitoring stations reported ozone concentrations up to 1190 mg/m. In order to investigate this phenomenon, two different air quality modeling approaches are used here: U The FLEXTRA ...

In this paper, a class of fractional advection-dispersion models (FADMs) is considered. These models include five fractional advection-dispersion models, i.e., the times FADM, the mobile/immobile time FADM with a time Caputo fractional derivative 0 < γ < 1, the space FADM with two sides Riemann-Liouville derivatives, the timespace FADM and the time fractional advection-diffusion-wave model with...

The objective of this study is to carry out a parametric sensitivity analysis of PHAST atmospheric dispersion modelling for an accidental toxic gas release scenario. A methodology is developed and is applied to a nitric oxide gas dispersion scenario. We study the relative influence of uncertainty in independent input parameters (storage conditions, atmospheric variables, release parameters and ...

This paper examines spatial variations in exposure to toxic air pollution from industrial facilities in urban areas of the United States, using geographic microdata from the U.S. Environmental Protection Agency’s Risk‐Screening Environmental Indicators project. We find that average exposure in an urban area is positively correlated with the extent of racial ...

We analyze the effects of free trade on environmental policies in a strategic setting with transboundary pollution. Trade liberalization can result in a race to the bottom in environmental outcomes, making both countries worse off. With command and control policies (quotas), there is no race to the bottom. However, with internationally tradable permits, unless pollution is a pure global public ...

The impact of organic species which are present in the Earth’s atmosphere on the burst of new particles is critically important for the understanding of the molecular nature of atmospheric nucleation phenomena. Amines have recently been proposed as possible stabilizers of binary pre-nucleation clusters. In order to advance the understanding of atmospheric nucleation phenomena, a quantum-chemica...

Tommy Ohlsson∗ Institut für Theoretische Physik, Physik Department, Technische Universität München, James-Franck-Straße, DE-85748 Garching bei München, Germany and Division of Mathematical Physics, Theoretical Physics, Department of Physics, Royal Institute of Technology, SE-100 44 Stockholm, Sweden (Dated: April 18, 2008) In this paper, we show that a Gaussian averaged neutrino oscillation mod...

Natural resource managers face complex challenges in addressing non-point source water pollution. A participatory modeling approach was applied in the St. Albans Bay watershed to identify the most effective phosphorus control options to achieve the load reductions required by the Lake Champlain Phosphorus Total Maximum Daily Load (TMDL). Stakeholders participated in the collection of data in th...

A CO2 laser dispersion interferometer (DI) has been developed for both magnetically fusion plasmas and atmospheric pressure plasmas. The DI measures the phase shift caused by dispersion in a medium. Therefore, it is insensitive to mechanical vibrations and changes in the neutral gas density, which degrade the resolution of the plasma measurement. We installed the DI on the Large Helical Device ...