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Sarandí sits within the densely populated Avellaneda Partido, serving as a vital cog in the Greater Buenos Aires metropolitan machine. Located on the vast, low-lying alluvial plains of the Pampas, the terrain is remarkably flat, offering little topographic relief to disrupt local airflow. This flatness is a critical determinant of its atmospheric behavior, as it allows pollutants to settle or drift unimpeded across the urban sprawl. To the north and west, the city is inextricably linked to the Matanza-Riachuelo river basin, a historically significant but heavily industrialized corridor. This proximity introduces a complex urban-rural gradient where dense residential pockets are tightly interwoven with significant manufacturing zones and logistics hubs. The presence of heavy industrial activity along the river, combined with the high density of vehicular traffic on major arteries like the Autopista Buenos Aires-La Plata, creates a concentrated zone of anthropogenic emissions. Furthermore, the lack of significant elevation means that the city experiences minimal natural dispersion of particulate matter, especially when meteorological conditions stagnate. The surrounding landscape is characterized by an intense urban fabric that transitions into the sprawling industrial belts of the southern metropolitan area, rather than immediate agricultural openness. This configuration means that Sarandí often acts as a catchment area for various pollutants, influenced by both localized industrial output and the broader regional atmospheric circulation that sweeps across the humid subtropical plains of the Buenos Aires province and its vast coastal reaches, effectively trapping pollutants within the lower troposphere during periods of low wind speed and high humidity.

Sarandí’s air quality is dictated by the seasonal rhythms of the humid subtropical climate. During the summer months, particularly January and February, high temperatures and intense solar radiation can trigger photochemical smog, as vehicular and industrial emissions react in the heat. However, heavy convective summer storms often provide a cleansing effect, temporarily washing particulates from the sky. As autumn arrives in April and May, the transition brings cooler temperatures and more frequent temperature inversions. During these periods, a layer of warm air can trap cooler, pollutant-laden air near the surface, leading to noticeable spikes in particulate matter. Winter, spanning June through August, presents the most challenging period for respiratory health. The combination of lower temperatures, reduced atmospheric mixing, and increased domestic heating or industrial activity can lead to stagnant, heavy air. The "Pampero" winds—strong, cool winds from the southwest—are the primary natural remediators, sweeping through the region and significantly improving air quality by displacing stagnant urban pollutants. Conversely, during calm, humid periods in late spring, the air can feel heavy and laden with aerosols. For optimal outdoor activity, the breezy, post-storm windows in spring or the windy days in winter are often preferable. Sensitive groups, including children, the elderly, and those with pre-existing asthma, should monitor local conditions closely during autumn and winter inversions. On days when air feels particularly stagnant or heavy, limiting strenuous outdoor exercise can help mitigate the inhalation of concentrated pollutants and maintain respiratory wellness throughout the duration of these high-risk meteorological events in the region.