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Title Let's Clear the Air
Subject Air--Pollution
Description The Thirty-Sixth Annual Frederick William Reynolds Lecture.
Creator De Nevers, Noel, 1932-
Publisher The Frederick William Reynolds Association
Date 1973-02-20
Date Digital 2008-05-29
Type Text
Format image/jpeg
Digitization Specifications Original scanned on Epson Expression 10000XL flatbed scanner and saved as 400 ppi uncompressed tiff. Display images generated in PhotoshopCS and uploaded into CONTENTdm Aquisition Station.
Resource Identifier,1266
Source TD883 .D45 1973
Language eng
Relation Digital reproduction of "Let's clear the air," J. Willard Marriott Library Special Collections
Rights Digital Image Copyright University of Utah
Metadata Cataloger Seungkeol Choe; Ken Rockwell
ARK ark:/87278/s6ht2m87
Setname uu_fwrl
Date Created 2008-07-29
Date Modified 2008-07-29
ID 320531
Reference URL

Page Metadata

Title Page12
Description 12 THE THIRTY-SIXTH ANNUAL REYNOLDS LECTURE This approach assumes that we can never reduce our air pollution damages to zero. That is a subject of some controversy, which is best discussed in terms of "threshold values." This "threshold value" concept is illustrated by comparing the following two figures: NO THRESHOLD' TYPE CURVE DAM AG E DAMAGE POLLUTION IN AIR CONCENTRATION POLLUTION IN AIR CONCENTRATION In both of these figures (which are conceptual and do not represent any specific case), I have plotted damage vertically and air-pollutant concentration horizontally. Here damage may be damage to life, health, property, etc. The air-pollutant concentration can be annual average, hourly maximum, etc. Regardless of which pollutant or which damage or concentration we are talking about, the concept is the same. This kind of figure is commonly called a "dose-response" curve, because in laboratory tests one administers a specific dose of the material being tested and then observes the response of the subject (normally a laboratory animal) to the material being tested. In this case, the air-pollutant concentration corresponds to the dose; and damage is the response. In pharmacology, where the doses are of various kinds of drugs, these types of dose-response curves have been widely studied and theoretically analyzed. The theory and the experimental results agree in finding that the no-threshold type of curve (the one on the left) is the most commonly observed behavior. As lower and lower doses are used, the results fall on a curve which, when extrapolated to zero dose, shows that any dose, no matter how small, must produce some response. However, in industrial hygiene, the commonly accepted curve is the "threshold-value" curve, of the type shown on the right. On this figure, it is assumed that there is some concentration, called the threshold value, below which there is no measurable effect of the pollutant (or, in industrial hygiene, the material being handled) on the subject (normally, the
Format image/jpeg
Identifier 014-RNLT-DeNeversN_Page12.jpg
Source Original Manuscript: Let's Clear the Air by Noel de Nevers.
Setname uu_fwrl
Date Created 2008-07-29
Date Modified 2008-07-29
ID 320514
Reference URL