Chamber studies generally show that the aerosol forming yield of to date well-studied marine biological gases is rather low; 2-7 % for dimethylsulfide (DMS) , around 2 % for isoprene and 1-68 % for monoterpenes depending on the species . In contrast, the SOA forming yield is much higher for benzene and toluene (30 %), especially in low-NOx regimes . Benzene and toluene are traditionally associated with anthropogenic emissions -the largest sources being coal or petroleum combustion, crude oil processing and solvent use followed by biomass burning .