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Title: An assessment of acid fog

Airborne particles have long been associated with adverse effects on public health, begin with the notorious air pollution disasters of several decades ago. Although H{sub 2}SO{sub 4} was identified early on as a potential causal factors during these episodes (in part because of concern for potential health effects of particle acidity per se has intensified only recently. Most of the recent aerometric research in the US on acid fog has focused on the ability of clouds and fog to deliver acidity to vegetation and ecosystems. Strong acids are characterized chemically by their pH or H{sup +} concentration. For fog, concentrations are referred to the droplet liquid content; for other (i.e., ``clear air``) aerosols, to the volume of air sampled. A useful measure of the relationship between aerosol and fog is obtained by comparing their mass concentrations on the basis of the same volume of air, by multiplying fogwater concentrations by liquid water content (LWC). This paper reviews fog measurement capability, physical properties and chemistry, and presents a simple urban airshed model which is used to simulate the evolution of fog and aerosol concentrations under urban stagnation conditions.
Authors:
Publication Date:
OSTI Identifier:
10142897
Report Number(s):
BNL--48499; CONF-920556--1
ON: DE93009347; TRN: 93:015163
DOE Contract Number:
AC02-76CH00016
Resource Type:
Conference
Resource Relation:
Conference: International symposium on measurement of toxic and related air pollutants,Durham, NC (United States),4-8 May 1992; Other Information: PBD: [1992]
Research Org:
Brookhaven National Lab., Upton, NY (United States)
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; FOG; ACIDIFICATION; CHEMISTRY; DROPLETS; PRECIPITATION SCAVENGING; AEROSOLS; SULFATES; AMMONIA; CHEMICAL COMPOSITION; NITRIC ACID; AIR POLLUTION 540110; 540120; BASIC STUDIES; CHEMICALS MONITORING AND TRANSPORT