Page 1 |
Save page Remove page | Previous | 1 of 210 | Next |
|
small (250x250 max)
medium (500x500 max)
large ( > 500x500)
Full Resolution
All (PDF)
|
This page
All
Subset |
MEASUREMENT AND METHODS OF ASSESSING THE IMPACT OF PREVALENT PARTICULATE MATTER SOURCES ON AIR QUALITY IN SOUTHERN CALIFORNIA
by
Harich Chandra Phuleria
____________________________________________________________________
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(ENVIRONMENTAL ENGINEERING)
May 2007
Copyright 2007 Harish Chandra Phuleria
Object Description
| Title | Measurement and methods of assessing the impact of prevalent particulate matter sources on air quality in southern California |
| Author | Phuleria, Harish Chandra |
| Author email | phuleria@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Environmental Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2007-03-05 |
| Date submitted | 2007 |
| Restricted until | Unrestricted |
| Date published | 2007-05-03 |
| Advisor (committee chair) | Sioutas, Constantinos |
| Advisor (committee member) |
Phares, Dennis Pirbazari, Massoud |
| Abstract | Recent focus of studies on health effects of ambient particulate matter (PM) have suggested particle chemical composition in addition to particle size, shape and number concentration responsible for the observed health outcomes. However, chemical composition and size distribution of the atmospheric particles can be strongly affected by the differences in ambient temperature, relative humidity, photochemical activity and source contributions. This thesis is intended to demonstrate the importance of characterizing predominant PM sources from an exposure perspective and develop methods of assessing their impact on air quality in Southern California. A study of particle number concentration and size distribution showed seasonal and spatial variability in Southern California. While contribution of local vehicular emissions was most evident in winter, effects of long-range transport of particles and photochemical particle formation were enhanced during warmer periods. Ship emissions are found to be dominant source of lower accumulation and ultrafine particles near ports. During the wildfires in October 2003 in Southern California, PM10 (particulate matter with aerodynamic diameter 10 mm and less) levels were found highly elevated, while ozone concentrations dropped during the fire episode and these fire-borne particles were found to effectively penetrate indoors. To characterize the emission profiles from on-road diesel and gasoline vehicle-fleets, size-segregated PM samples were collected inside the Caldecott tunnel in Orinda, CA and analyzed for vehicular organic tracers such as hopanes and steranes, and polycyclic aromatic hydrocarbons (PAHs). In a separate study, detailed information on the chemical characteristics of organic PM originating from a pure gasoline and a diesel dominated mixed-traffic freeway is obtained.; While hopanes and steranes, and high molecular weight PAHs levels are found comparable near these freeways, elemental carbon and lighter molecular weight PAHs are found much elevated near diesel dominated mixed-fleet freeway. Remarkably good agreement is observed between the roadside measurements and the emission factors calculated from the tunnel measurements especially for hopanes and steranes. Our results indicate that the fleet composition as well as atmospheric dilution has strong impact on the ambient concentrations of these organic tracers. |
| Keyword | particulate matter; air quality; southern California; gasoline and diesel emissions; organics tracers; seasonal spatial and temporal variability |
| Geographic subject (state) | California |
| Geographic subject (country) | USA |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Type | texts |
| Legacy record ID | usctheses-m471 |
| Rights | Phuleria, Harish Chandra |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-Phuleria-20070503 |
| Archival file | uscthesesreloadpub_Volume40/etd-Phuleria-20070503.pdf |
Description
| Title | Page 1 |
| Full text | MEASUREMENT AND METHODS OF ASSESSING THE IMPACT OF PREVALENT PARTICULATE MATTER SOURCES ON AIR QUALITY IN SOUTHERN CALIFORNIA by Harich Chandra Phuleria ____________________________________________________________________ A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (ENVIRONMENTAL ENGINEERING) May 2007 Copyright 2007 Harish Chandra Phuleria |
Comments
Post a Comment for Page 1
