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Castelli, nestled in the heart of the Chaco Province of Argentina, occupies a geographically significant position within the Gran Chaco Americano, a vast ecoregion characterized by thorny scrub forests and grasslands. Located at approximately -25.95° latitude and -60.61° longitude, the city sits at a relatively low elevation of around 130 meters above sea level, contributing to a generally stable atmospheric layer. The surrounding landscape is predominantly flat, a feature typical of the Chaco plain, with expansive agricultural lands dominating the immediate periphery. This proximity to intensive agricultural zones, particularly soybean and maize cultivation, is a crucial factor influencing Castelli’s air quality. The city’s urban character is that of a regional hub, serving as a commercial and administrative center for the surrounding agricultural communities. While not situated directly on a major river, the Bermejo River flows nearby, influencing local humidity and potentially affecting the dispersion of pollutants. The urban–rural gradient is gradual, with agricultural fields quickly transitioning to residential areas within the city limits. The prevailing winds generally flow from the southeast, carrying potential pollutants from agricultural activities and distant industrial areas. The flat terrain and lack of significant topographical features limit natural ventilation, occasionally leading to pollutant accumulation, especially during periods of stagnant air. The regional position, far from major industrial belts, means that long-range transport of pollutants is less of a concern than localized emissions.

Castelli’s air quality experiences a distinct seasonal cycle dictated by the region’s subtropical climate. The wet season, typically spanning from November to March, brings increased humidity and frequent rainfall, generally leading to improved air quality as precipitation washes away particulate matter. However, the intense agricultural activity during this period, including fertilizer application and harvesting, can release ammonia and other agricultural pollutants, occasionally causing localized spikes. The dry season, from April to October, presents a more complex picture. As humidity decreases and rainfall diminishes, the atmosphere becomes more stable, increasing the likelihood of temperature inversions, particularly during the cooler months of June and July. These inversions trap pollutants near the ground, leading to potential air quality concerns. Wind patterns during the dry season are often weaker and more variable, further hindering pollutant dispersion. August and September often see the highest potential for stagnant air conditions. The months of March and April, transitioning between wet and dry seasons, can experience elevated dust levels due to soil disturbance from agricultural practices. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during periods of stagnant air, particularly during the dry season. Outdoor activities are generally more favorable during the wet season, but awareness of agricultural emissions remains important. Monitoring local weather forecasts for temperature inversions and reduced wind speeds is advisable for all residents.