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Puerto San Martín, nestled within the province of Santa Fe, Argentina, occupies a strategic position along the Paraná River, approximately 15 kilometers northeast of the larger city of Rosario. Its coordinates, -32.7167, -60.7333, place it within the humid subtropical zone of the Pampas region, a vast, fertile plain characterized by flat, low-lying terrain. The city’s geography is fundamentally shaped by its riverine location; the Paraná River acts as a significant transport corridor and influences local climate patterns. The surrounding landscape is predominantly agricultural, with extensive fields of soybeans, wheat, and maize stretching towards the horizon, contributing to both the regional economy and potential sources of particulate matter. The urban–rural gradient is relatively sharp, transitioning quickly from the built environment of Puerto San Martín to the intensive agricultural lands. Elevation is minimal, rarely exceeding 30 meters above sea level, which can exacerbate air quality issues as it limits atmospheric dispersion. While not directly adjacent to major industrial belts, Puerto San Martín benefits from, and is impacted by, the industrial activity concentrated in Rosario, particularly concerning emissions from port operations, chemical plants, and manufacturing facilities. The flat topography and proximity to the river also create conditions conducive to temperature inversions, especially during cooler months, trapping pollutants closer to the ground. The Paraná River's influence extends to humidity levels, which can affect the deposition of airborne particles and the perception of air quality.

Puerto San Martín’s air quality experiences a distinct seasonal cycle driven by meteorological factors. Summer (December-February) typically sees relatively good air quality due to increased convective mixing – warmer temperatures and stronger winds help disperse pollutants. However, agricultural burning, a common practice in the surrounding Pampas region to clear fields, can occasionally lead to spikes in particulate matter during this period, particularly in early December. Autumn (March-May) often brings calmer conditions and a gradual increase in humidity, potentially trapping pollutants. Temperature inversions become more frequent as nights cool, leading to periods of stagnant air and elevated concentrations of certain pollutants. Spring (September-November) mirrors summer in terms of generally improved air quality, though the transition period can be variable. Winter (June-August) presents the most significant air quality challenges. Cold, stable air masses, coupled with frequent temperature inversions and fog, severely limit atmospheric mixing. This results in prolonged periods of poor air quality, with pollutants accumulating near the ground. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during these months, particularly on days with dense fog or calm winds. Agricultural activities, including fertilizer application, can also contribute to ammonia emissions during this season. Maintaining indoor air quality through proper ventilation and air purification can be beneficial during winter. Awareness of regional agricultural practices and their potential impact on air quality is crucial for informed decision-making regarding outdoor activities.