Concept

National Ambient Air Quality Standards

Publications associées (130)

Numerical simulation of the links between air pollution, aerosols and solar radiation

Hubert van den Bergh, Alain Clappier, Martin Junier, Yves-Alain F. Roulet

The links between air pollution gas phase chem., aerosol chem. processes, and solar radiation are calcd. to improve air quality models. Air quality models are used to simulate pollutant content of the city plumes such as for Los Angeles. ...

2001

Modeling ozonation as pre-treatment step for the biological batch degradation of industrial wastewater containing 3-methyl-pyridine

Urs von Gunten

A combined chemical-biological treatment of industrial wastewater using ozonation as the first step of a Sequencing Batch Biofilm Reactor (SBBR) process, in which 3-methylpyridine (3MEP) was degraded as a model industrial pollutant, has been developed. The ...

2001

Forecasting air quality in the Greater Athens area for the year 2004: An intercomparison of the results of four different dispersion models

Hubert van den Bergh

Forecasts for the NOx concentration levels in the Greater Athens area in 2004 are compared to the corresponding figures for 1990. Simulations are performed for two meteorological cases using four different dispersion models. Two different emission inventor ...

2000

Measurement of formaldehyde (HCHO) by DOAS: intercomparison to DNPH measurements and interpretation from Eulerian model calculations

Hubert van den Bergh, Bertrand Calpini

Formaldehyde is a primary and secondary air pollutant. As an intermediate product of hydrocarbon photooxidn., it contributes to the formation of photochem. pollution in urban areas. In addn., chronic or acute exposure to HCHO (a possible carcinogen) consti ...

2000

Estimation of the total VOC reactivity with OH by pump-and-probe OH lidar to determine a new indicator for ozone production

Many of our most severe problems of environmental pollution involve the Earth's atmosphere. The adverse effects of atmospheric pollution are particularly evident in the low troposphere, especially in urban/suburban areas where many sources contribute to th ...

EPFL2000

Evidence of primary air pollutant reduction and photochemical pollution enhancement after opening a road tunnel to the public

Hubert van den Bergh, Bertrand Calpini

Measurements of local air pollution and road traffic were taken during a period of one month before and after the opening of a road tunnel to the public in nearby Sachseln, a small city located in a rural region (Obwald) at the center of Switzerland. Two 5 ...

1999

The regional pollutant budget of the atmospheric boundary layer: Concept, interpretations and observational results

Michael Lehning

Regional budgets of pollutants in the atmospheric boundary layer (ABL) provide valuable information on transport and chemical processes, especially over complex terrain where local assessments are not representative. Horizontal transport, vertical transpor ...

1998

Ozone LIDAR as an analytical tool in effective air pollution management. The Geneva 96 campaign

Hubert van den Bergh, Bertrand Calpini, Valentin Simeonov

The LIDAR principle for air quality and meteorol. measurements is presented, followed by different examples of vertical O3 profiles and time series obtained with a new optical layout of the EPFL-LPAS DIAL system using dual telescope detection. These data w ...

1997

Environomic Optimization of District Heating Network Systems with Both Centralized and Decentralized Heat Pumps.

Daniel Favrat, Vinicio Curti

In Switzerland like in many countries, many of the populated areas are located close to lakes or rivers, offering a large potential for the use of heat pumps. Although district heating is an obvious solution, adapting the delivery temperature to the most e ...

1997

Effects of Atmospheric Processing on the Oxidative Potential of Biomass Burning Organic Aerosols

Athanasios Nenes, Kalliopi Violaki

Oxidative potential (OP), which is the ability of certain components in atmospheric particles to generate reactive oxidative species (ROS) and deplete antioxidants in vivo, is a prevailing toxicological mechanism underlying the adverse health effects assoc ...

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