Thom, Gary C. <br/><br/>
Air pollution indices compendium and assessment of indices used in the United States and Canada / 
Gary C. Thom and Wayne R. Ott 
 - Ann Arbor, Mich. :  Ann Arbor Science,  1976 
 - xi, 164 p. :  graphs ;  28 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0252401487 
<br/><br/><label>LCCN: </label>76-041114 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air quality--Standards--United States<br/>Air quality--Standards--Canada