An @A00176@ originating from combustion, thermal @D01547@ or thermal @E02227@. Its particles may be solid (magnesium oxide smoke) or liquid (tobacco smoke).
PAC, 1972, 31, 577. (Manual of Symbols and Terminology for Physicochemical Quantities and Units, Appendix II: Definitions, Terminology and Symbols in Colloid and Surface Chemistry) on page 606 [Terms] [Paper]
See also:
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2214 [Terms] [Paper]