Abstract: The study addresses the escalating levels of atmospheric methane, emphasizing the role of landfills as significant contributors to global methane emissions. Focusing on the Metropolitan Region of Sao Paulo, Brazil, the research investigates the impact of landfills on methane concentration, particularly examining super emitters and methane hotspots. Utilizing the Metroclima project framework, the study conducted field campaigns on July 6 and November 22, 2023, employing a microportable greenhouse gas analyzer. Meteorological parameters from ERA5 and the AERMOD Modeling System were utilized for comprehensive analysis. The results reveal that wind parameters play a crucial role in concentration values, influencing the values obtained by the equipment. The values found indicate elevated methane concentrations near the landfill entrance, with some measured points in the city exhibiting values significantly above the normal range. The emission rate analysis identifies the Caieiras landfill as a super emitter, emitting methane at rates exceeding 3,000 kg/h. The study highlights the importance of understanding landfill emissions and their implications for atmospheric methane levels.

Keywords: Methane, Landfills, Microportable greenhouse gas analyzer, AERMOD.