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Arrecifes, nestled within the province of Buenos Aires, Argentina, occupies a geographically significant position within the Pampas region. Located approximately 110 kilometers northwest of Buenos Aires city, it sits at an elevation of roughly 85 meters above sea level, contributing to a relatively flat terrain characteristic of the fertile plains. The city’s coordinates (-34.0667, -60.1167) place it within a landscape dominated by agricultural land, primarily dedicated to cattle ranching and grain cultivation – a defining feature of the surrounding area. The Paraná River, though not directly adjacent, influences the regional climate and atmospheric conditions, occasionally contributing to humidity and fog. Arrecifes’ urban character is that of a small, agricultural service center, exhibiting a gradual urban–rural gradient as one moves outwards. The immediate vicinity is largely farmland, transitioning to more extensive agricultural zones. While not situated directly within a major industrial belt, its proximity to Buenos Aires means it can be affected by pollution transported from the capital, particularly during periods of stagnant air. The Pampas’ generally open landscape allows for some dispersion of pollutants, but prevailing wind patterns and temperature inversions can significantly impact local air quality. The surrounding landscape, a mosaic of fields and pastures, plays a role in particulate matter emissions, particularly during agricultural activities like harvesting and tilling. The relatively low elevation and flat topography can exacerbate the effects of temperature inversions, trapping pollutants closer to the ground.

Arrecifes experiences a humid subtropical climate, resulting in distinct seasonal variations that significantly influence air quality. The warmer months, typically December to February, are characterized by higher temperatures and humidity, often leading to stagnant air conditions and a greater potential for ozone formation. While rainfall can provide some cleansing effect, the increased solar radiation promotes photochemical smog. Spring (September to November) often sees improved air quality as winds increase and temperatures moderate, though agricultural activities can contribute to particulate matter. Autumn (March to May) presents a mixed picture. Cooler temperatures can occasionally trigger temperature inversions, trapping pollutants, while the drying vegetation can also release particulate matter. The months of April and May are particularly susceptible to this. Winter (June to August) generally brings the most stable and potentially problematic air quality. Cold, clear nights frequently lead to temperature inversions, where a layer of cold air becomes trapped beneath a warmer layer aloft. This prevents vertical mixing, concentrating pollutants near the ground. Fog, common during winter mornings, further exacerbates this issue by trapping particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during these periods, particularly on days with visible fog or stagnant air. Increased awareness of agricultural burning practices, which may occur during harvest seasons, is also crucial for minimizing exposure to particulate matter. Maintaining indoor air quality through ventilation and air purification can offer additional protection.