National ambient air quality statistics of India 1990 

 - Delhi  Central Pollution Control Board  1991 
 - 88p. 
 - National ambient air quality monitoring series: Naaqms/3/1991-92 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air pollution<br/>Air quality - India
<br/><br/><label>Dewey Class. No.: </label>X91x54 N213