CaltechAUTHORS
  A Caltech Library Service

On the relationship between sulfate air quality and visibility with examples in Los Angeles

Cass, Glen R. (1979) On the relationship between sulfate air quality and visibility with examples in Los Angeles. Atmospheric Environment, 13 (8). pp. 1069-1084. ISSN 1352-2310 . http://resolver.caltech.edu/CaltechAUTHORS:20140626-092940668

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item: http://resolver.caltech.edu/CaltechAUTHORS:20140626-092940668

Abstract

Routine air monitoring data are related to visibility in downtown Los Angeles over the decade 1965–1974. A non-linear regression model for light extinction is employed which uses particle chemical composition as a key to particle size and solubility. Sulfates and oxides of nitrogen (NO_2 and nitrates) plus particulates correlated with NO_2 are implicated as the major contributors to visibility reduction in downtown Los Angeles. It is shown that there is a pronounced increase in light scattering per unit sulfate solute mass on days of high relative humidity, as would be expected for a hygroscopic or deliquescent substance. Using the chemically resolved regression model, estimates are made of the long-run visibility impact of reducing sulfates to one half and to one quarter of their measured historic values on each past day of record. It is found that the effect of such a sulfate concentration reduction would have been manifested most clearly by a substantial reduction in the number of days per year with average visibility less than 3 miles (4.8 km).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/0004-6981(79)90031-3DOIArticle
http://www.sciencedirect.com/science/article/pii/0004698179900313PublisherArticle
http://resolver.caltech.edu/CaltechEQL:EQL-M-18Related ItemThe Relationship Between Sulfate Air Quality and Visibility at Los Angeles, Caltech Environmental Quality Laboratory Memorandum 18, August 1976
Additional Information:© 1979 Pergamon Press Ltd. First received 10 October 1978 and in final form 19 January 1979. This work has been supported by the Ford Foundation (Grant No. 740-0469), a grant to the author from Rockwell International, gifts to the Environmental Quality Laboratory, and by the California Air Resources Board (Contract No. A5-061-87). Thanks are due to the staff of the Metropolitan Zone of the South Coast Air Quality Management District (formerly the Los Angeles Air Pollution Control District) for their cooperation and assistance in furnishing data for this analysis. A somewhat longer version of this study has been distributed under the title The Relationship Between Sulfate Air Quality and Visibility at Los Angeles, Caltech Environmental Quality Laboratory Memorandum 18, August 1976. It forms a portion of the regional sulfate air quality control strategy study referenced to Cass (1978).
Group:Environmental Quality Laboratory
Funders:
Funding AgencyGrant Number
Ford Foundation740-0469
Rockwell InternationalUNSPECIFIED
Environmental Quality LaboratoryUNSPECIFIED
California Air Resources BoardA5-061-87
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Environmental Quality LaboratoryA-37
Record Number:CaltechAUTHORS:20140626-092940668
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140626-092940668
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46525
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Jun 2014 17:17
Last Modified:26 Jun 2014 18:15

Repository Staff Only: item control page