GEMS/AIR Methodology review handbook series / 
UNEP. 
 - 1st  ed. 
 - Nairobi :  UNEP,  1994. 
 - 2 v. 
<br/><br/>Volume 1. Quality assurance in urban air quality monitoring - Volume 2. Primary standard calibration methods and network intercalibrations for air quality monitoring. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Air pollution--Measurement.<br/>Urban pollution.