Worldwide coliform bacteria are used as indicators of fecal contamination and hence, the possible presence of disease causing organisms. Therefore, it is important to understand the potential and limitations of these indicator organisms before realistically implementing guidelines and regulations to safeguard our water resources and public health. This review addresses the limitations of curren...

The control of air pollution is more of an art than a science, still lacking an adequate power of numeration to qualify as a truly scientific discipI-ine, despite a long history of concern about it. There was, for example, legislation against air pollution in London in the 13th century, and, until the time of Pasteur, sundry qualities of "night airs" and "fetid vapours" were held re~ sponsible ...

We consider a mixed reaction diffusion system describing the organic pollution in stream-waters. It may be viewed as the static version of Streeter–Phelps equations relating the Biochemical Oxygen Demand and Dissolved Oxygen to which dispersion terms are added. In this work, we propose a mixed variational formulation and prove its well-posedness. Next, we develop two finite element discretizati...

The paper presents an expert system, SBC-MEDIU, developed` for environmental diagnosis. Two modules of the system are discussed in detail: the module for air pollution analysis and dispersion assessments, SBC-AIR, and the module for soil erosion risk assessments, SBC-SOIL. Both modules provide at the end of the analysis the environmental diagnosis result and the associated allert code. Some exp...

Wintertime temperature profiles in the Grand Canyon exhibit a neutral to isothermal stratification during both daytime and nighttime, with only rare instances of actual temperature inversions. The canyon warms during daytime and cools during nighttime more or less uniformly through the canyon’s entire depth. This weak stability and temperature structure evolution differ from other Rocky Mountai...

The SATURN project aimed at a better understanding of urban air pollution as a prerequisite for finding effective solutions to air quality problems and for a sustainable development in the urban environment. The results of this project, which was concluded at the end of 2002, constitute a significant improvement of the state-of-the-art in the science of urban air pollution: • Field experiments ...

Air pollution is one of the major threats to environment in the present time. Increase in degree of urbanization is a major cause of this air pollution. Due to urbanization, vehicular activities are continuously increasing at a tremendous rate. Mobile or vehicular pollution is predominantly degrading the air quality worldwide. Thus, air quality management is necessary for dealing with this seve...

air pollution is one of the most challengeable problems in the asalouyeh zone. in order to reduce the air pollutants emission and their effects it is necessary to recognize the amount and spatial dispersion of air pollutants. hence in this paper, evaporative losses of the stored liquids from 16 tanks of an oil company in asalouyeh zone, are determined using tanks 4.0.9d and then dispersion of v...

Exposure to airborne pollution has substantial adverse health consequences. A recent World Health Organization (WHO) study has estimated that urban air pollution accounts for 6.4 million years of life lost worldwide annually (Cohen et al. 2004). Many harmful pollutants are emitted by automobiles. For example, Currie and Walker (2011) estimate that prenatal exposure to traffic congestion alone r...