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Villa Mercedes, situated in the central-western region of San Luis Province, Argentina, occupies a unique geographic position within the undulating plains transitioning to the foothills of the Sierras Pampeanas. Located at approximately 650 meters above sea level, the city benefits from a relatively dry climate, characteristic of the Chaco ecoregion. The terrain is predominantly flat, interspersed with low hills, and drained by the Tercero River, which flows nearby but doesn’t directly bisect the urban core. This riverine influence, while providing some moisture, is limited in its capacity to disperse pollutants. Surrounding Villa Mercedes is a landscape dominated by agricultural activity, primarily focused on soybean, corn, and wheat cultivation, alongside livestock farming. To the west, the land becomes increasingly arid, while to the east, the foothills introduce more complex topography. The urban-rural gradient is fairly sharp, with a noticeable increase in dust and agricultural particulate matter as one moves away from the city center. Limited heavy industry within Villa Mercedes itself means that regional agricultural practices and occasional dust storms are the primary drivers of local air quality concerns, compounded by vehicle emissions within the growing urban area. The prevailing winds, generally from the west, can transport pollutants from agricultural zones directly over the city.

Villa Mercedes experiences a distinct seasonal air quality pattern dictated by its semi-arid climate. Spring (September-November) sees a gradual improvement in air quality as rainfall increases, washing away accumulated dust from the dry winter months. However, agricultural burning begins during this period, potentially leading to localized spikes in particulate matter. Summer (December-February) is typically the period of best air quality, with consistent rainfall and higher temperatures promoting dispersion. Autumn (March-May) marks a transition, with decreasing rainfall and increasing wind speeds that can stir up dust. This is often a period of moderate air quality. Winter (June-August) presents the most challenging conditions. Low temperatures create stable atmospheric layers, leading to temperature inversions that trap pollutants near the ground. Reduced rainfall means dust and agricultural residue remain suspended for longer periods. Sensitive individuals, including those with respiratory conditions and the elderly, should limit strenuous outdoor activity during prolonged winter inversions. Dry, windy days in autumn also warrant caution. Monitoring wind direction is crucial, as westerly winds bring pollutants from agricultural areas. The lack of significant industrial emissions means that agricultural practices and dust are the dominant seasonal influences.