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Resistencia, the capital of Argentina's Chaco Province, occupies a distinctive geographic position in northeastern Argentina's Gran Chaco region, situated on the western bank of the Paraná River opposite the city of Corrientes. This strategic riverfront location at approximately 50 meters above sea level places it within the humid subtropical Chaco plains, characterized by flat terrain with gentle undulations and seasonal wetlands known as esteros. The city's urban character blends administrative functions with commercial and cultural activities, serving as a regional hub for the surrounding agricultural hinterland dominated by cotton, soybeans, and livestock production. Resistencia's air quality is fundamentally shaped by its geographic context: the flat topography limits natural ventilation, while proximity to the Paraná River provides some moderating humidity but minimal cleansing effects due to the river's north-south orientation. The urban-rural gradient shows dense urban core transitioning to peri-urban areas and then extensive agricultural lands, creating a complex pollution profile where urban emissions mix with agricultural dust and biomass burning from surrounding fields. The city's position within South America's interior means it receives continental air masses rather than maritime influences, contributing to temperature extremes that affect pollution dispersion. Surrounding landscapes of alluvial plains and gallery forests create microclimates that occasionally trap pollutants, particularly during stable atmospheric conditions.

Resistencia's air quality follows distinct seasonal patterns shaped by its humid subtropical climate with pronounced wet and dry seasons. During summer (December-February), high temperatures reaching 35°C combine with increased humidity from the Paraná River basin, creating conditions where pollutants like ozone can form through photochemical reactions, particularly during afternoon heat. However, frequent convective thunderstorms and stronger winds provide natural cleansing, making late summer mornings generally favorable for outdoor activity. Autumn (March-May) brings transitional conditions with decreasing rainfall and more stable atmospheric patterns, potentially allowing particulate matter from agricultural activities and urban emissions to accumulate, especially during calm periods. Winter (June-August) represents the peak pollution concern period, as cooler temperatures (averaging 15-20°C) frequently create temperature inversions that trap pollutants near the surface, compounded by increased biomass burning for heating in peri-urban areas and agricultural residue burning in surrounding fields. Sensitive groups should limit prolonged outdoor exposure during winter mornings when inversions are strongest. Spring (September-November) sees improving conditions as increasing temperatures and winds disperse pollutants, though occasional dust from agricultural preparation and variable rainfall patterns can create short-term air quality issues. The city experiences no monsoon but does have occasional fog during winter that can combine with pollution to reduce visibility and air quality.