Abstract: A method of evaluating and measuring the smell of urine is disclosed. The method includes collecting urine samples from at least two donors and pooling the samples together into a combined sample. At least about 99% of the microbes are then removed from the combined sample to obtain a microbe-free sample. The microbe-free sample is then inoculated with at least two known microbes. The method also includes introducing the inoculated sample into a material or product and allowing the microbes to grow and emit malodors. The material or product is then evaluated for malodors that smell like urine to establish an odor intensity level. The method further includes recording the odor intensity level and scoring the odor intensity level.