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Filadelfia, nestled in the Boquerón Department of Paraguay, occupies a geographically significant position within the Gran Chaco region. Located at approximately -22.34° latitude and -60.03° longitude, the city’s terrain is predominantly characterized by flat, expansive plains, typical of the Chaco’s low-lying landscape. The surrounding environment is a mosaic of dry forests, grasslands, and agricultural lands, reflecting the region’s semi-arid climate. Elevation is minimal, averaging around 150 meters above sea level, contributing to a lack of natural air circulation and potential for pollutant accumulation. While not directly adjacent to major rivers, Filadelfia draws water from smaller tributaries and groundwater sources, influencing local humidity levels. The city’s regional position is crucial; it lies within a zone experiencing increasing agricultural intensification, particularly soybean and cattle farming, which can contribute to dust and ammonia emissions. The urban–rural gradient is relatively sharp, with agricultural activities dominating the immediate periphery. This proximity to intensive farming practices, combined with the flat topography and limited elevation changes, creates conditions where air pollutants can linger, especially during periods of low wind speed. The lack of significant natural barriers means that pollutants from distant sources, carried by prevailing winds, can also impact air quality in Filadelfia. The city’s small size (population 18,210) means that localized industrial activity, primarily related to agricultural processing, is the most immediate concern for air quality.

Filadelfia’s air quality experiences a distinct seasonal pattern dictated by its subtropical climate, characterized by a pronounced wet and dry season. The dry season, typically spanning from April to October, presents the greatest air quality challenges. During these months, lower rainfall and higher temperatures lead to increased dust generation from agricultural fields and unpaved roads. The lack of significant precipitation means that particulate matter accumulates, and the prevailing winds, often light and variable, are insufficient to disperse pollutants effectively. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, exacerbating the situation. Conversely, the wet season (November to March) brings relief through frequent rainfall, which naturally cleanses the atmosphere and reduces particulate concentrations. However, heavy rainfall can also lead to increased humidity and the release of biogenic volatile organic compounds (BVOCs) from vegetation, potentially contributing to ground-level ozone formation under specific conditions. The months of July and August are generally the most challenging for air quality, with consistently elevated dust levels. Outdoor activities are best planned during the wet season, particularly in the mornings when humidity is higher. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, minimizing prolonged exposure to outdoor air, especially on windy days or when dust plumes are visible. Agricultural burning, a common practice in the surrounding areas, can significantly degrade air quality during the transition periods between seasons, creating unpredictable spikes in pollution.