D-limonene is one of the dominant terpenoids in indoor environment,which can be emitted from cleaning products and air fresheners.D-limonene is prone to oxidation resulting in the formation of secondary pollutants including secondary organic aerosol (SOA),hydrogen peroxide and organic peroxide which can pose health risks on residents.In this study,we investigated the effect of ammonia (NH3) on the formation of indoor SOA,hydrogen peroxide and organic peroxide from ozone/d-limonene reactions.The experimental results demonstrated that the presence of NH3 (maximum concentration is 240 ppb) could significantly enhance the yields of SOA from the ozonolysis of d-limonene,but it had negligible effect on the production of hydrogen peroxide and organic peroxide.The maximum total particle number concentration generated from the oxidation reactions was up to 1.3×105 #cm-3 in the presence of NH3,while it was 5.7×104 #cm-3 which was 43% lower without NH3.The total peroxides concentration was approximately 0.9 ppb with and without NH3 existence.The maximum concentrations of hydrogen peroxide and organic peroxide were 0.7 ppb and 0.2 ppb,respectively.The mechanism regarding to the NH3 effect on the generation of indoor secondary pollutants from ozone/d-limonene reactions was further discussed.