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Gálvez, nestled in the heart of Santa Fe Province, Argentina, occupies a relatively flat expanse within the expansive Mesopotamian plains. Situated at approximately -32.0333 latitude and -61.2167 longitude, the city’s geography is profoundly shaped by its proximity to the Paraná River, a major fluvial artery of South America. The terrain is gently undulating, characteristic of the region’s alluvial origins, with an elevation hovering around 25 meters above sea level. Gálvez functions as a regional service centre for a predominantly agricultural hinterland, heavily focused on soybean, wheat, and maize cultivation. This agricultural dominance significantly influences local air quality, with seasonal burning of crop residue being a key contributor to particulate matter. The urban-rural gradient is relatively sharp, transitioning quickly from the concentrated built environment of Gálvez to vast agricultural fields. While not a major industrial hub, the presence of agro-processing facilities and transport infrastructure related to agricultural exports adds to potential emission sources. The prevailing winds, generally from the north, can transport pollutants from upstream agricultural activities and potentially from larger industrial centres further south. The Paraná River, while offering a cooling influence, also contributes to humidity, which can exacerbate the effects of certain pollutants.

Gálvez experiences a humid subtropical climate, resulting in distinct seasonal air quality patterns. Spring (September-November) sees a gradual improvement in air quality following the cooler, wetter winter months. However, the preparation of fields for planting often involves controlled burns, leading to temporary spikes in particulate matter, particularly PM2.5. Summer (December-February) is typically the period of best air quality, with frequent rainfall effectively cleansing the atmosphere and higher temperatures promoting dispersion. Autumn (March-May) marks a transition, with increasing agricultural activity and the potential for stagnant air masses. This is often when the highest concentrations of pollutants are observed, particularly from agricultural sources. Winter (June-August), while generally cooler and drier, can experience temperature inversions, trapping pollutants near the ground. These inversions, combined with increased residential heating using wood or other solid fuels, can lead to elevated levels of particulate matter and carbon monoxide. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during autumn and winter, and be mindful of air quality on calm, cool mornings. Monitoring wind direction is crucial, as northerly winds can bring pollutants from agricultural burning.