air pollutant Articles
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Applicability Assessment of Coherent Doppler Wind LiDAR for Monitoring during Dusty Weather at the Northern Edge of the Tibetan Plateau
Abstract: Wind profile light detection and ranging (LiDAR) is an important tool for observing features within the atmospheric boundary layer. Observations of the wind field and boundary layer height from coherent Doppler wind LiDARs (CDWLs) under sandy and dusty weather conditions were evaluated using observations from two CDWLs and one GTS radio sounding located at the northern edge of the ...
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Xact 625i in Nationwide Atmospheric Network
Xact 625i has been selected for the ASCENT network for characterizing aerosols in high time resolution using state-of-the-art instruments. SailBri Cooper, Inc. is pleased to announce its participation in Atmospheric SCience and mEasurement NeTwork (ASCENT). This new air monitoring network in the United States was made possible by a $12 million grant from the Mid-Scale Research Infrastructure ...
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Signal to Noise Ratio Estimations for a Volcanic Ash detection lidar
In this paper we calculate the Signal-to-Noise (SNR) ratio of a 3-channel commercial volcanic ash detection system, (Raymetrics lidar model LR111-D300), already in operation for the Met Office organization. The methodology for the accurate estimation is presented for day and nighttime conditions. The results show that SNR values are higher than 10 for ranges up to 13 km for both nighttime and ...
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Mixing characteristics of refractory black carbon aerosols determined by a tandem CPMA-SP2 system at an urban site in Beijing
Abstract Black carbon aerosols play an important role in climate change by absorbing solar radiation and degrading visibility. In this study, the mixing state of refractory black carbon (rBC) at an urban site in Beijing was studied with a single 15 particle soot photometer (SP2), as well as a tandem observation system with a centrifugal particle mass analyzer (CPMA) and a differential mobility ...
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Why monitor dust in the workplace?
Almost any place of employment can present a potential threat to health and safety from airborne particulates and aerosols. It is important to note, however, that dust hazards are not necessarily visible to the human eye and that the finest particles can represent the greatest threat because of their ability to travel deepest into the lungs. Effective monitoring is therefore key to the ...
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Sources and physicochemical characteristics of black carbon aerosol from the southeastern Tibetan Plateau: internal mixing enhances light absorption
Abstract. Black carbon (BC) aerosol has important effects on the climate and hydrology of the Tibetan Plateau (TP). An intensive measurement campaign was conducted at Lulang ( ∼ 3300 m a.s.l. – above sea level), southeastern TP, from September to October 2015, to investigate the sources and physicochemical characteristics of refractory BC (rBC) aerosol. The average rBC mass ...
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Elemental composition of ambient aerosols measured with high temporal resolution using an online XRF spectrometer
Markus Furger1,*, María Cruz Minguillón2, Varun Yadav3, Jay G. Slowik1, Christoph Hüglin4, Roman Fröhlich1, Krag Petterson3, Urs Baltensperger1, André S. H. Prévôt1 1Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, 5232 Villigen 5 PSI, Switzerland 2Institute of Environmental Assessment and Water Research (IDAEA), Consejo Superior de ...
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Ionic composition of aerosols at Northwestern Turkey
In this study, ionic compositions of 350 aerosol samples collected between April 2006 and May 2008 in a rural area at Northwestern Turkey (Black Sea coast of Turkey) were discussed. Ions accounted for approximately 30% of PM mass. Contributions of secondary aerosol species (NO3−, SO42− and NH42+) were higher than the ions with crustal origin. This indicated that sampling station was under the ...
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Atmospheric transport model applied to understand the effect of biogenic emissions to secondary atmospheric aerosol in hemiboreal zone
The SILAM model with built–in isoprene and monoterpene emission module from natural sources was run for May to August 2006 in Baltic Sea region. In this study VOCs were advected as passive tracers. Modelled hourly VOC–tracer concentrations were compared with sub–half–micrometre aerosol concentrations, simultaneously measured in Preila (Lithuania), Tahkuse (Estonia), Hyytiälä (southern Finland) ...
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Variations in mass concentrations of airborne particulate matter over tropical urban environment
Particulate matter (PM) is an important component of the air pollution that has adverse health effects, ecosystem damage and degraded visibility. We analysed the seasonal variations in PM loading from ground-based measurements of PM1.0 and PM2.5, Aerosol Optical Depth (AOD) Black Carbon (BC) aerosol over Hyderabad, India during January-June, 2006. The PM concentrations showed relatively higher ...
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Particulate matter, halogen and aerosols - Case Study
Example: Production of anodes for aluminium smelters as well as electronic industry (TFT-LCD) Similar tasks: Carbon and graphite industry, smelting of aluminium, coating of metals An anode producer has several ring furnaces to stabilise the anodes by carbonization for later processing in a melting bath. The hot exhaust gases pass through double walls in between the anodes where the gases are ...
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Geochemical behaviour of the aerosol sampled in a suburban zone of Sfax City (Tunisia)
This work examines the geochemistry of the soluble elements (Ca2+, Mg2+, Fe2+ + Fe3+, Na+, K+, NH4+, Cl−, NO3−, SO42− and PO43−) present in the aerosol collected from a suburban site in Sfax City (Tunisia), which is frequently subjected to the urban plume. The descriptive study showed the influence of enrichment sources and meteorological factors. Complementary statistical approaches based on ...
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Remote sensing of particulate pollution from space: Have we reached the promised land?
This paper follows presentation and publication of the Hoff and Christopher 2009 Critical Review and represents an integration of discussants’ views of their paper. The discussants’ comments are organized beginning with a note on the history of satellite sensing, followed with a brief discussion of the strengths and weaknesses of satellite observations relative to air quality management needs. ...
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Urban indoor-outdoor aerosol measurements in Portugal and the global warming scenario
Aerosols play a major role both in climate change and air quality. They affect climate by interfering with radiative transfer and the atmospheric temperature. Aerosol particulate matter has also been associated with various adverse health effects. Aerosol particles' number and size distributions were measured inside and outside the houses in the urban areas of Evora and Lisbon in Portugal. The ...
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Applying hourly measurements of meteorological data and aerosol soluble ions in Taipei Basin, Taiwan
This study applies observational data composed of hourly weather and aerosol to discuss the aerosol characteristics within different weather systems. Based on cluster analysis, spring weather in Taipei Basin 2004 was characterised as five weather systems: humid/low south wind speed, dry cold/high east wind speed, humid cold/east wind, dry cold/northeaster, and northwestern convection wind. Under ...
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Relation of earth probe TOMS/AI data and ground level measured atmospheric aerosols over Marmara region
The main aim of this study is to statistically investigate the correlation between TOMS/Aerosol Index (AI) remote sensing particulate data and Ground Level (GL) aerosol concentrations. GL fine and coarse particles are collected from watershed area of Buyukcekmece at Marmara region in Istanbul, Turkey (41°0.04′ N; 28°0.59′ E). Randomly collected, 24 hr GL samples are statistically compared with ...
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Eliminating Man-Made Hazein Protected Areas: A Goal of the Regional Haze Rule
In recognition of the value of good visibility in areas set aside for their scenic splendor, Section 169A of the 1977 U.S. clean Air Act Amendments established a national goal of remedying existing visibility impairment and preventing future visibility impairment resulting from man-made air pollution emissions at 156 national parks and wilderness areas, referred to as visibility-protected federal ...
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Influence of accidental fire on black carbon aerosol concentrations over an urban environment
Carbonaceous aerosols are emitted by combustion sources and may influence the climate by altering the radiation balance of the atmosphere. Carbonaceous particles exist mainly in the accumulation mode and thus may be transported over long distances. The present study deals with the impact of anthropogenic activity associated with accidental fires on the black carbon aerosol concentrations over an ...
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Modelling of aerosol in the Greater Athens Area, Greece
Aerosols have recently been defined as a serious atmospheric pollution problem in the Greater Athens Area (GAA). This research is mainly focused on assessing the PM10 concentration levels in the GAA atmosphere through simulations. The model results of the chemical constituents of PM10 are satisfactory comparing to measurements; the discrepancies are attributed to the re-suspended and seaborne ...
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Temporal behaviour of Asian dust aerosols observed in 2001 using meteorological satellite data
The advection and dispersion of Asian dust events from China and Mongolia to the Pacific Ocean around Japan in the spring of 2001 were investigated using meteorological satellite data, NOAA/AVHRR and GMS-5/VISSR. Aerosol Vapour Index (AVI) images, taking the brightness temperature difference between 11 and 12 _m, are very effective in monitoring the Asian dust phenomenon in the east Asian region, ...
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