[Objectives]  To evaluate the effectiveness of six compounds, and combinations of these, as lures for trapping female Aedes albopictusmosquitoes in the field. [Methods]  The attractiveness of three fatty acids (acetic acid, propionic acid and octanoic acid) and their ammonium salts (ammonium acetate, ammonium propionate, and ammonium octanoate) were assessed based on the number of female mosquitoes captured in traps. [Results]  Acetic acid, propionic acid, octanoic acid, and their ammonium salts, were all significantly more attractive to female mosquitoes than the distilled water control. Equivalent dosages of these compounds ranked in attractiveness as follows; acetic acid > propionic acid = octanoic acid = ammonium acetate > ammonium propionate > ammonium octanoate. The mean accumulated number of females trapped by 1∶1 to 1∶4 ratios of fatty acids and their respective ammonium salts were significantly greater than the number captured using either fatty acids in isolation or the distilled water control (P < 0.05). This demonstrates a synergistic effect between the fatty acids and their respective ammonium salts. The most optimum ratio was a 1∶2 combination of fatty acid and ammonium salt. The mean accumulated number of mosquitoes captured using this formulation was 27.56%, 27.66%, and 26.98% higher, respectively, than either acetic acid, propionic acid, octanoic acid alone, 41.64%, 41.18%, and 40.35% higher than with ammonium, and 72.29%, 72.25%, and 72.66% higher than the distilled water control (P < 0.05). [Conclusion]  A 1∶2 combination of a fatty acid and its ammonium salt can significantly increase and prolong the effectiveness of mosquito trapping compared to using just the fatty acid alone. Fatty acid ammonium salts are also have the advantage of being odorless to humans and therefore more suitable for use in the home or office environment.