- Map impact obtained with a Gaussian dispersion model, which operates with meteorological data from a local surface station in the zone of study, to calculate the relative concentrations of odor compounds emitted diffusely from the processing plant. - Annotations of smell perception of odor by neighbors in a scale range from 1 to 5. This is done systematically at least three times at day, in the periods 0-8 hours, 8-16 hours, and 16-24 hours. And also annotations are done during the strong odor episodes, indicating the duration and scale of annoyance. - Chemical analysis of air during several periods of 24 hours. The system is composed of a chemical compound adsorption multisorbent tube with a forced air flow, that is later analyzed by combining thermal desorption with high-resolution gas chromatography and mass spectrometry detection (TD-GC-MS) method.

This methodology shows that validated odor impact maps obtained could be a very useful tool to improve the air quality.