traffic pollution modeling Articles

Tri-Mer catalytic ceramic filters use glass emissions filter technology with nano-bits of SCR catalyst embedded in the walls - Case study

Filters are placed in housings and operate similarly to a “reverse pulse jet ceramic baghouse.” The filters are 10' long and 6" wide, with a wall thickness of approximately ¾ inch. Learn more information about Tri-Mer&rsquos;s hot gas filtration. ...

May 31, 2019

By Tri-Mer Air Pollution Control Systems

Micro Pulse LiDAR: A Critical Tool for Emissions Source Detection

Micro Pulse LiDAR remote sensing data are used to calculate a highly accurate Planetary Boundary Layer (PBL) height to improve plume models that help assess emissions sources. ...

Mar. 21, 2019

By Micro Pulse LiDAR, part of Hexagon

How much does it cost to build a sand and grave plant?

To answer this question, we need to determine the following factors. The type and size of the sandstone plant determines its investment amount. How much is the processing capacity? The investment in sand and grave washing plant of different production scales varies greatly. What is the ...

Jun. 11, 2019

By Luoyang Longzhong Heavy Machinery Co., Ltd.

Mining Emissions Effectively Monitored with Micro Pulse LiDAR Technology

Mining operations include blasting, excavating, scraping, and sifting large amounts of dirt. These activities create dust and other emissions that are transported by air currents to surrounding areas. It is easy to say that dangerous particulate matter (PM) generated by mining should be monitored and kept to a minimum; however, it is very challenging to measure the levels of contaminants in the ...

Jan. 23, 2019

By Micro Pulse LiDAR, part of Hexagon

Unpredictable Volcanic Ash Plumes Restrict Air Traffic

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Jul. 28, 2018

By Micro Pulse LiDAR, part of Hexagon

Alternative Fuels - A Look At the Current Environment

Overview Vehicles powered by gasoline and diesel account for emissions of dangerous air pollutants and contribute to the presence of greenhouse gases. Consumers, businesses, and public entities looking for environmentally friendly alternatives to gasoline and diesel-powered cars and trucks have viable choices beyond the well-known battery electric and plug-in hybrid electric ...

Jun. 13, 2019

By PureAire Monitoring Systems, Inc

Researchers are Advancing Science Using Micro Pulse LiDAR Technology

There are so many examples of interesting research using Micro Pulse LiDAR (MPL) technology it is difficult to decide on my favorites; however, I have chosen to highlight the following two papers because these applications for the MPL and MiniMPL address problems that are very important to global health. ...

Nov. 5, 2018

By Micro Pulse LiDAR, part of Hexagon

CBRN Water Monitors

WANTED: CBRN (Chemical, Biological, Radiological, Nuclear) Water Monitors ...

Jun. 17, 2019

By US Nuclear Corporation

Micro Pulse Lidar: Perfect Tool for Atmospheric Research

Micro pulse style lidars are active remote sensing tools proven to be highly useful in atmospheric research. This style of backscatter lidar has been around for decades; however, incremental improvements in photon counting, sensitivity, polarization, optical filters, coatings, and precision machining of each element support increasingly accurate analysis. Each iteration of the ...

Aug. 2, 2018

By Micro Pulse LiDAR, part of Hexagon

Multiple Instruments Work Together for a Better View of Air Quality

Accurately identifying and quantifying particulate matter (PM) in the atmosphere is key to determining air quality. Researchers are particularly interested in PM that have a diameter of less than 2.5 micrometers because they are believed to contribute to heart and lung disease in humans and animals. These tiny particles are invisible to the naked eye and originate from power plants, fires, and ...

Nov. 19, 2018

By Micro Pulse LiDAR, part of Hexagon

Top 5 Differences between Micro Pulse LiDAR and Ceilometer Technology

If you are evaluating backscatter LiDAR sensors for measuring aerosols, cloud vertical structure, and planetary boundary layer (PBL) heights, what factors should you consider in your comparison? It really comes down to a choice between the traditional analog technology used in ceilometers and the more recent advanced technology found in Micro Pulse LiDAR (MPL) sensors. ...

Sep. 27, 2018

By Micro Pulse LiDAR, part of Hexagon

Modelling of air pollution from road traffic

This paper presents the basic principles of the method of calculating air pollution from road traffic in an urban built-up area. The algorithm of the method is based on the numerical integration of stationary two-dimensional partial differential equations of turbulent diffusion, with boundary conditions for the street canyons. The method consists of two modules: KALIB and STREETS, which calculate ...

Jan. 25, 2004

By Inderscience Publishers

A street canyon model for low wind-speed conditions

The aim of the present work is to develop a simple model in order to calculate the vertical pollutant distribution inside a street canyon at low wind speed. It is aimed at providing a relationship between traffic emission and the pollutant in excess. It is assumed that street ventilation is controlled by the vertical turbulent diffusion. The diffusion coefficient Kz must be known. In the ...

Jan. 25, 2004

By Inderscience Publishers

Numerical modelling of gas dispersion from road tunnels in urban environments: comparison with field experiment data

Numerical computations and field experiments of the dispersion of a tracer gas from a road tunnel in Paris are compared. The Reynolds-averaged Navier-Stokes equations, combined with the k-ε turbulence model of Chen and Kim, are solved using the finite-volume code PHOENICS. Results are shown to be sensitive to the turbulence modelling and to the parameterisation of turbulence and drag forces ...

Sep. 14, 2009

By Inderscience Publishers

Dispersion modelling of traffic particulate matter in city–scale area

This paper introduces utilisation of the CFD technique for modelling of PM10 (particulate matter 10 µm) dispersion in urban areas, with focus on detailed description of processes in the ground surface boundary layer. The description of deposition and re–suspension processes is introduced and applied on the city–scale model of the city of Brno (pop. 400,000). The air threshold ...

Jun. 17, 2012

By Inderscience Publishers

Particle re-suspension in street canyon with two-way traffic

The paper focuses on determination of the wind threshold velocity of re-suspension (at the height of 10 m) and the near-ground air threshold velocity of re-suspension (at the height of 0.25 m) for particles of size 10 µm in a particular urban street canyon with two-way traffic. The wind threshold velocity of re-suspension is derived from a long-term measurement carried out in the city of Brno. A ...

Feb. 7, 2011

By Inderscience Publishers

Estimating the benefits of clean air contingent valuation and hedonic price methods

This study deals with the estimation of willingness to pay for a 50% reduction of air pollution caused by road traffic in Rabat-Sale (Morocco) using contingent valuation and hedonic price methods. In the CVM, two techniques are employed. These are iterative bidding and dichotomous choice. Both empirical analyses are based on the same set of individuals. This strategy enables us to compare the ...

Feb. 9, 2004

By Inderscience Publishers

Measurements, model simulations and reduction of CO concentrations inside an urban road tunnel in Milan

A programme to improve the air quality inside the road tunnels of the Italian city of Milan has involved three steps: 1) evaluation of the air pollution levels inside some tunnels; 2) planning an air improvement project for one tunnel, supported by effectiveness evaluation; 3) implementation of this project. The characterisation of the air quality was carried out by measuring the typical traffic ...

Jan. 25, 2004

By Inderscience Publishers

WORM: A new open road line source model for low wind speed conditions

Emission from road traffic constitutes one of the most important sources of air pollution in urban areas. This paper describes a newly developed air pollution dispersion model for open roads and highways called WORM (Weak Wind Open Road Model), and give some results using this model at Nordbysletta, Norway, in the period 1 January 200215 April 2002. Generally, a good correspondence was found ...

Jun. 17, 2012

By Inderscience Publishers

Short distance modification of vehicular exhaust VOC fingerprint

This work aims to investigate how volatile organic compounds (VOCs) emitted from vehicular exhausts behave in regard to their role in pollutant photochemical reactions at very short distances from their source. Results obtained with a receptor model of ambient VOC data measured at two sampling sites in the city of Rome, placed at different distances from the traffic line, have been compared with ...

Jan. 25, 2004

By Inderscience Publishers

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