Journal ArticleDOI
Source apportionment of secondary airborne particulate matter in a polluted atmosphere
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TLDR
A mechanistic air quality model is demonstrated that can predict source contributions to the size distribution of secondary airborne particulate matter and suggests that the public health risk associated with air pollution released from transportation sources is significant relative to other public health threats such as traffic accidents.Abstract:
Secondary airborne particulate matter formed from gas-phase pollutants contributes significantly to the most severe particulate air quality events that occur in the United States each year. In this study, a mechanistic air quality model is demonstrated that can predict source contributions to the size distribution of secondary airborne particulate matter. Calculations performed for a typical air quality episode in Southern California show that NOx released from diesel engines and catalyst-equipped gasoline engines account for the majority of the secondary particulate nitrate aerosol measured at inland locations. NH3 released from catalyst-equipped gasoline engines, farm animals, and residential sources account for the majority of the secondary particulate ammonium ion at inland locations in the region. When both tailpipe and road dust emissions are considered, transportation sources dominate the size distribution of total (primary plus secondary) airborne particulate matter in the South Coast Air Basin during the episode studied. These findings suggest that the public health risk associated with air pollution released from transportation sources is significant relative to other public health threats such as traffic accidents.read more
Citations
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Measurements of particle number and mass concentrations and size distributions in a tunnel environment.
TL;DR: Less particle mass but more particle numbers are emitted by vehicles than was the case 7 years ago in comparison to previous studies at the Caldecott Tunnel.
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Fine (PM2.5) and coarse (PM2.5-10) particulate matter on a heavily trafficked London highway: sources and processes.
Aurélie Charron,Roy M. Harrison +1 more
TL;DR: The analysis of factors leading to the highest 5% of hourly concentrations of PM10 at Marylebone Road reveals that almost half of these events were due to building works, a strong correlation with PMcoarse suggests that the heavy-duty traffic is largely responsible for this component also.
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Elemental characterization and source apportionment of PM10 and PM2.5 in the western coastal area of central Taiwan
Chin-Yu Hsu,Hung-Che Chiang,Sheng-Lun Lin,Mu-Jean Chen,Tzu-Yu Lin,Yu-Cheng Chen,Yu-Cheng Chen +6 more
TL;DR: This study investigated seasonal variations in PM10 and PM2.5 mass and associated trace metal concentrations in a residential area in proximity to the crude oil refinery plants and industrial parks of central Taiwan to aid efforts to clarify the impact of source-specific origins on human health.
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Evaluating the first‐order effect of intraannual temperature variability on urban air pollution
Jeremy Aw,Michael J. Kleeman +1 more
TL;DR: In this article, the direct effect of intraannual temperature variability on ozone and PM2.5 concentrations at the urban scale was simulated using a high-resolution air quality model that tracks the temperature-dependant formation of secondary organic and inorganic aerosol components.
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The role of natural gas and its infrastructure in mitigating greenhouse gas emissions, improving regional air quality, and renewable resource integration
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References
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TL;DR: The data suggest that increased daily mortality is specifically associated with particle mass constituents found in the aerodynamic diameter size range under 2.5 urn, that is, with combustion-related particles.
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Second-generation inorganic aerosol model
TL;DR: In this article, an improved theory of the temperature and composition dependence of deliquescence was proposed to predict the size distribution of the inorganic components of atmospheric aerosols, which can account for both therthermodynamic properties of the aerosol particles and transport between the gas and aerosol phases.
Journal ArticleDOI
Response of Inorganic PM to Precursor Concentrations
Asif S. Ansari,Spyros N. Pandis +1 more
TL;DR: In this paper, an inorganic aerosol equilibrium model is used to investigate the response of inorganic particulate matter (PM) concentrations with respect to the precursor concentrations of sulfuric acid, ammonia, and nitric acid over a range of temperatures and relative humidities.
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Comparative Application of Multiple Receptor Methods To Identify Aerosol Sources in Northern Vermont
TL;DR: This study applies and compares results of four receptor modeling techniques to a common set of speciated fine particle measurement data collected at a remote site in northwestern Vermont between 1988 and 1995 to indicate a strong regional character to the upwind locations associated with aerosol contributions from most of the sources identified independently by the mathematical models.