Air quality criteria and guides for urban air pollutants : report of a WHO Expert committee [meeting held in Geneva from 5 to 11 April 1972]. 

 - 35p. 
 - (WHO technical report series ; 506) .
<br/><br/><label>ISBN: </label>92-4-120506-7 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air--Standards<br/>Air pollutants--Adverse effects<br/>Urban health