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Chacabuco, nestled in the northern reaches of Buenos Aires Province, Argentina, occupies a gently undulating pampa landscape. The city’s coordinates (-34.6333, -60.4667) place it within a predominantly agricultural zone, characterized by extensive soybean, wheat, and corn cultivation. The terrain is relatively flat, with a gradual rise towards the Ventania hills to the southwest, offering minimal natural barriers to air mass movement. The Salado River flows nearby, though its influence on local air quality is more related to agricultural runoff and potential dust generation from exposed riverbanks than direct industrial discharge. Chacabuco’s urban character is that of a provincial capital, serving as a commercial and administrative hub for the surrounding agricultural communities. The urban-rural gradient is sharp; the city itself is compact, quickly giving way to vast agricultural fields. This proximity to intensive farming practices is a key determinant of air quality, with seasonal agricultural burning and pesticide application contributing to particulate matter and volatile organic compound concentrations. The lack of significant industrial belts within the city limits means that transport and agricultural emissions are the dominant pollution sources. Prevailing winds generally flow from the northwest, carrying pollutants across the pampa.

Chacabuco experiences a temperate climate with distinct seasons, profoundly impacting air quality. Spring (September-November) sees a rise in agricultural activity, including land preparation and initial planting, leading to increased dust and particulate matter from field work. Mild temperatures and occasional rainfall help to disperse pollutants, but wind patterns can concentrate them locally. Summer (December-February) brings the highest temperatures and potential for stagnant air, exacerbating pollution from vehicle emissions and agricultural sources. Dry conditions increase the risk of wildfires, further degrading air quality. Autumn (March-May) is often marked by controlled agricultural burns to clear fields after harvest, resulting in significant spikes in particulate matter, particularly during calm weather. This is generally the worst period for respiratory health. Winter (June-August) offers the cleanest air, with reduced agricultural activity and increased rainfall washing away pollutants. However, temperature inversions can trap pollutants near the ground, especially during calm, cold nights. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit outdoor exertion during autumn burn seasons and summer heatwaves. Monitoring wind direction is crucial, as pollutants often travel from agricultural areas into the city.