gaseous pollutants Articles
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Comparison of model predictions and measurements near a major road in an urban area
We have compared measured concentration data with predictions from a dispersion modelling system. The measurement campaign was conducted near a major road in the Helsinki Metropolitan area during two months of 1994. The concentrations of five gaseous pollutants (NO, NO2, O3, CO and SO2) were measured at three heights, together with the simultaneous measurement of traffic densities and the ...
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Gaseous pollutant dispersion around urban-canopy elements: wind tunnel case studies
There is an evident lack of reliable and detailed in situ measurement data for verifying numerical predictions of atmospheric dispersion in the urban environment on sub-meso scales. Wind-tunnel studies of dispersion around typical elements of the urban canopy (isolated buildings, groups of buildings, street canyons) could provide valuable substitutes for field datasets. They can achieve a high ...
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Elevated PM10 concentrations and high PM2.5/PM10 ratio in the Brussels Urban area during the 2006 car-free Sunday
The results of the Car-Free Sundays in Brussels demonstrate the close relationship between the traffic and the presence of the gaseous pollutants such as NO, NO2, CO, CO2 and O3 in a traffic environment. The relationship with PM10 and PM2.5 seems to be much more complex. In fact, the PM10 and PM2.5 concentrations on the Car-Free Sunday 2006 were amongst the highest that year and they were three ...
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Factory Flue Gas Treatment Methods
Flue gas treatment is a process that removes pollutants from exhaust gases produced by industrial processes, power plants, and other sources before they are emitted into the atmosphere. Specific flue gas treatment processes can vary based on the type of contaminants and regulatory requirements. The following is an overview of typical flue gas treatment processes: Flue Gas Collection: The first ...
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Air dispersion modelling for individual exposure studies
The concentration fluctuations of a dispersing hazardous gaseous pollutant in the atmospheric boundary layer, and the hazard associated with short–term concentration levels, demonstrate the necessity of estimating the magnitude of these fluctuations using predicting models. To predict and estimate the maximum expected dosage and the exposure time within which the dosage exceeds certain health ...
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Efficient calculation of urban scale air pollutant dispersion and transformation using the OFIS model within the framework of CityDelta
CityDelta is a model intercomparison exercise that assesses the performance of the participating models and compares them against observational data, allowing at the same time their validation and further development. In this framework, OFIS, an Eulerian photochemical dispersion model, was applied in several European cities, for both gaseous pollutants and particulate matter. The basic concept of ...
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Once Upon a Time – the Founding of OPSIS
35 years ago, in October 1985, the “Opsis Aktiebolag” (or just “OPSIS”) was registered as a private limited company. By that time, the two founders and owners Leif Unéus and Svante Wallin had a vision of using spectroscopy as a tool for measurements of gaseous pollution in ambient air. They even had an almost working instrument! What preceded the registration? As in many other cases, it was a ...
By OPSIS AB
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4 Ways of Ambient Air Quality Monitoring Systems and Equipments
Real-time Ambient Air Quality Monitoring Applications Oizom specializes in manufacturing and designing accurate Air Quality Monitoring systems and offering advanced data analytics. Founded in 2015, Oizom is currently present in more than 40 countries, providing air pollution measuring systems. Oizom technology has gained the trust and confidence of air quality experts across the globe. With more ...
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Interlaboratory tests of emission measurements in France using a testing bench
ABSTRACT It is well known that interlaboratory tests are a powerful tool to improve the quality of measurements. However they are difficult and costly to organise in the framework of emission measurements because of several reasons (too small measuring platforms, access to industrial plants…). In order to facilitate these tests, French authorities asked INERIS to built a testing bench, ...
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What is a wet scrubber and how it works?
A wet scrubber is a mechanical system that removes contaminants from a gas stream by contacting it with a scrubbing liquid, most commonly water. Wet scrubbers are often the only air pollution control devices that can remove both particulates and gases/vapors. They are very efficient at capturing the smallest dust particles and can trap them in droplets, eliminating over 99% of airborne particles. ...
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Cross-flow scrubber design case study from Kimre
Cross-flow or, Horizontal-flow scrubber design is almost never mentioned in chemical engineering literature. Textbooks (1) used at universities for future engineers, undergraduate as well as graduate level students, invariably only discuss counter-current vertical scrubber tower design. Likewise, professional reference texts (2) generally provide little or no mention of horizontal cross-flow ...
By Kimre Inc.
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Urban air quality monitoring at Kars, Turkey - Case Study
Overview Kars Smart City monitored the urban air quality and environmental health by installing Oizom Polludrone – Online Pollution Monitoring System. In addition to Air Quality monitoring, the Polludrone also monitored the city’s urban weather conditions like temperature and humidity. The real-time data was dispersed to the mass audience through visual messaging ...
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Electrochemical oxidation of sulfite ions in aqueous solutions
Gaseous pollutants that affect human health, destroy vegetation and damage materials and art treasures can be converted into harmless components by electrochemical reactions. Electrochemical gas purification methods can be applied basically in two steps. In the first step, gases to be removed are absorbed in an aqueous electrolyte. Then, in the second step, they can be converted into harmless ...
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Study of vehicular emissions with reference to Pakistan's National Environmental Quality Standards: case study of District Swat, North of Pakistan
This study was conducted during 2011–2012 with the objective to assess the ambient air quality in the surroundings of a newly constructed road in relation to Pakistan's Environmental Quality Standard (Pak–NEQS). The area was monitored twice, before and during the construction, to determine levels of sulphur dioxide, nitrous oxide, carbon monoxide, and PM10 (particulate matter). A ...
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Using a photochemical air quality model to evaluate emissions and simulate concentrations
The air-quality modelling system was conducted to evaluate emissions inventory and simulate air concentration over Thailand. The coupling model of the Regional Atmospheric Modelling System (RAMS) and the models-3 Community Multi-scale Air Quality (CMAQ) was applied to simulate the concentration distributions of gaseous pollutants (i.e., NOx, SO2 and CO) over the Central and Eastern regions of ...
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The Big Three - On-line monitoring of green house gases
ABSTRACT National emissions regulations have historically targeted the common stack gas pollutants which have long been known to cause damage to health or ecology, but there is growing concern about the long term effects on the world’s climate from what were hitherto less obvious pollutants. The Kyoto Protocol has identified six gaseous pollutants as “green house gases” and the ...
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Utilization of lime-dried sludge for eco-cement clinker production: effects of different feeding points
Co-processing lime-dried sludge (LDS) in cement kilns is an appropriate technique to solve the problem of LDS disposal and promote the sustainable development for cement industry. However, there were limited studies that investigated the effects of feeding points on product quality and cement kiln emissions. In this study, simulated experiments were conducted by dividing the feeding points ...
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Monroe scrubber solves pollution and odor problems from a glass resin reactor at a synthetic fiber manufacturing plant
Monroe scrubber solves pollution and odor problems from a glass resin reactor at a synthetic fiber manufacturing plant Challenge The plant was emitting about 6.0 lbs/hr of toxic fumes from their resin reactor at a temperature of 200oF. The emitted gases to be cleaned were from hazardous, gaseous pollutants such as phenol and formaldehyde, as well as dust particulate. The collection efficiency ...
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Selecting the Right Air Quality Monitor
There are many types of air quality monitors available, but which one is the best choice for measuring gaseous air pollutant concentrations? There are two classes of such air quality monitors: sampling monitors and in-situ monitors (“in-situ” = “in the original position”). Sampling monitors utilises a manifold through which the air to be analysed is pumped. A small air ...
By OPSIS AB
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Gaseous emissions during concurrent combustion of biomass and non-recyclable municipal solid waste
Abstract Background: Biomass and municipal solid waste offer sustainable sources of energy; for example to meet heat and electricity demand in the form of combined cooling, heat and power. Combustion of biomass has a lesser impact than solid fossil fuels (e.g. coal) upon gas pollutant emissions, whilst energy recovery from municipal solid waste is a beneficial component of an integrated, ...
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