In popular usage, a term often taken to mean airborne effluents, unpleasant and malodorous,
            which might arise from chemical processes. 
            
            Source: 
            
                  
                  PAC, 1990, 62, 2167
                  (Glossary of atmospheric chemistry terms (Recommendations 1990))
                   on page 2191
            
 
         
            Cite as:
            IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
            A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
            XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
            J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. 
https://doi.org/10.1351/goldbook.