ozone monitoring Articles
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Water Vapor Interference in the UV Absorption Measurement of Atmospheric Ozone
In this thesis work, a significant and sometimes large water vapor interference inherent to many and possibly all UV-based, commercially available ozone monitors was positively identified for the first time. Depending upon the instrument's recent atmospheric history and calibration method, zone monitors can give erroneous results both immediately and hours later, and as a consequence possibly ...
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Ozone Monitoring
Ground-level ozone is harmful to human health and the environment, especially on sunny days when its concentration can reach high levels. Also, it is a precursor of photochemical smog, which has its fatal effects. Real-time O3 monitoring helps in calculating the air quality index to deliver health advisories as well as formulating an action plan to meet standards. This article covers information ...
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Determination of transport processes of nocturnal ozone in Istanbul atmosphere
Ozone, usually having a minimum value at night, often increase its concentration level which is known as nocturnal ozone. In this study, the magnitude, frequency and timing of nocturnal ozone maxima were determined between May and September for four years (2001-2004) for stations in the Asian and European sides of Istanbul, Turkey. The magnitude and frequency of late and early peaks for peak ...
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UV-radiation 1983–2003 measured at Norrköping, Sweden
Total ozone has been monitored with high accuracy at many sites for a relative long period of time. This is not the case for UV. The main reason is that UV is difficult to measure accurately. Extensivemonitoring started first during the 1990s. However, there are some data series still in operation that were initiated at earlier dates. This paperwill discuss one such series from Norrk€oping, ...
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Hotels Put Ozone to Work
Growing operational costs and lower-than average occupancy rates spurred Apple Farm Inn and Suites, San Luis Obispo, Ca., to explore economic and facility-efficiency benefits obtained through the installation of an ozone laundry system. At the Apple Farm Inn laundry facility, an evaluation lasting several months was conducted in late 2006 into 2007, comparing the costs of laundering by ...
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Use of Monte Carlo uncertainty analyses to evaluate differences in observed and predicted ozone concentrations
It is now possible to carry out Monte Carlo uncertainty studies with large photochemical grid models such as UAM-IV. The current study uses information on the effects of uncertainties in 109 input variables on UAM-IV model predictions of maximum daily one-hour averaged ozone concentrations at 29 monitoring sites in the New York City UAM domain for the 8 July 1988 ozone episode. Fifty Monte Carlo ...
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Air pollution by ozone across Europe during summer 2010
Ozone is a 'secondary' pollutant formed in the lower part of the atmosphere (the troposphere) from complex photochemical reactions following emissions of precursor gases such as nitrogen oxide and volatile organic compounds. Ozone is a powerful oxidising agent and one of the air pollutants of most concern in Europe. In Europe, ozone concentrations are also influenced by emissions in other ...
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The CaroMont Health Ozone Laundry System
Abstract Ozone generating equipment was retrofit into the laundry washroom of the Gaston Memorial Hospital in Gastonia, NC, and began operating in the early part of July, 2010. Three ozone generating systems service six washer-extractors in the washroom. The performance of this fine-bubble ozone diffusion laundering system has been monitored since that time, with various adjustments made to ...
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U.S. EPA Propses Revisions to Ozone NAAQS
In May 2008, states, environmental groups, and industry groups filed petitions with the D.C. Circuit Court of Appeals (Court) for review of the 2008 ozone standards. In March 2009, the Court granted a U.S. EPA request to stay the litigation so that the Obama administration could review the standards and determine whether they should be reconsidered. On September 16, 2009, U.S. EPA announced that ...
By All4 Inc.
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Air pollution by ozone in Europe in summer 2005
Ground-level ozone is one of the air pollutants of most concern in Europe. Ozone pollution is produced by photochemical processes involving nitrogen oxides and volatile organic compounds in the lower parts of the atmosphere. Ozone levels become particularly high in regions close to high ozone precursor emissions and during summer when stagnant meteorological conditions with high insolation and ...
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Ozone Based AOP process for refractory COD reduction in industrial waster water
Introduction In recent years improvements in ozone based advanced oxidation technology efficiencies have lowered capital and operating expenses, improving the viability of the use of ozone as the main oxidant. An investigation into alternatives for refractory COD removal which is economically attractive and do not produce sludge lead to an evaluation of ozone based advanced oxidation processes ...
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What is the Photometric Procedure for Ozone Transfer Standards
Ozone (O3) is a slightly blue or colorless gas made of three atoms and is found predominantly in the Earth’s atmosphere. At ground level, high ozone concentrations can be harmful to living organisms and the environment, and therefore, significant importance is placed on monitoring ozone levels. Ozone transfer standards are used in vital processes and equipment that analyze air quality, ...
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Evaluation of the chemistry transport model system KAMM/DRAIS, based on daytime ground-level ozone data
The main objective of this study was to estimate the reliability of the chemistry transport model KAMM/DRAIS to predict increased ozone concentrations near ground level. The evaluation was carried out on the basis of the ozone measurements collected during episodes of the TRACT, FLUMOB, and BERLIOZ experiments. The ozone data of all episodes have been evaluated for the time period between 10 UTC ...
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Benchmark Test - EPL unit compared to 50g/hr ceramic plate unit
We believe the main cause of this reduction in productive capacity is heat, with the ceramic plates reaching high temperatures after extended use. This is exacerbated in the summer months by the increase in ambient temperature, significantly impeding production capacity even on short runs. We commissioned EPL to produce an alternative unit that would be able to better cope with our requirements. ...
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Response of arbuscular mycorrhizal mungbean plants to ambient air pollution
Abstract:The experiments were conducted in open top chamber system installed at the University of the Punjab, Quaid-e-Azam Campus, Lahore, Pakistan. The mungbean (Vigna radiata (L.) Wilczek var.M28) seeds were sown in earthen pots and were kept in filtered air, unfiltered air and ambient air. The ozone concentration was monitored daily during 1000hrs till 1600 h. The data for light intensity and ...
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Environmental measurements at Monte Cimone GAW station
Continuous atmospheric CO 2 measurements performed by IAFMC at Mt. Cimone Observatory in the period 1980–2009 were analysed in order to select data representing background concentrations. A filtering technique was used to smooth background data and to separate the annual cycle from the long-term increase. The average growth rate of CO 2 was found to be 1.708 ± 0.003 ppm/year, while annual ...
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Seasonal and diurnal characteristics of surface level O3 and its precursors in the north-central part of India
Surface measurements of ozone and its precursor gases NO2 and CO have been made over an urban site of Agra (semi-arid region) for year 2005. O3, NO2 and CO show diurnal variations during all seasons. Overall increased concentration of O3 is majority attributed to increase in concentrations of NO2 and CO. The highest average concentration of O3 was observed in winters, followed by summers and ...
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Studying Clouds in the Antarctic with Micro Pulse LiDAR
Researchers in the Australian Antarctic Science project collected aerosol data above the Southern Ocean to improve their understanding of the connection between clouds and climate change. Evaporation and condensation are the basic concepts leading to cloud formation; however, many factors impact the end results. In general, as water vapor molecules rise from the surface of the Earth, they ...
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National Ambient Air Quality Standards Update
You have seen ALL4 documenting the corresponding evolution of the NAAQS levels since the current U.S. EPA administration started in January 2009, and we will continue to follow them closely and provide you with updates that we think are important to your operations. The following sections provide updates on the most important NAAQS and how you can plan for them today. Discusses SO2, air ...
By All4 Inc.
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Southern California Edison Santa Barbara I MGP in-situ ozone treatment groundwater progress monitoring
Southern California EdisonSanta Barbara - Former MGP siteIn-situ Ozone TreatmentPiper Case History #1-------------------------------------------------------Problem: Former MGP site containing VOC and PAH contamination needed aggressive soil and groundwater remediation.Project Solution: • Phase I - Limited Soil Excavation near Former Gasholder• Phase II – In-Situ Ozone Sparging for Deep Soils• ...
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