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Río Segundo, nestled within the province of Córdoba, Argentina, occupies a geographically significant position within the Pampas region. Located at approximately -31.6501° latitude and -63.9116° longitude, the city’s terrain is characterized by gently rolling plains, typical of the fertile agricultural lands that dominate the surrounding landscape. The Río Segundo itself, from which the city derives its name, meanders through the area, providing a crucial water source and influencing local microclimates. Córdoba province is situated in the heart of Argentina, acting as a bridge between the more arid northwest and the humid southeast. This central location contributes to Río Segundo’s role as a regional hub for agricultural processing and distribution. The urban–rural gradient transitions relatively quickly, with agricultural fields and pastures dominating the immediate periphery of the city. While Río Segundo itself is a relatively small settlement with a population of around 19,713, it’s situated within a broader industrial belt that extends along the railway lines connecting Córdoba city to the north and other agricultural centers to the south. This proximity to industrial activity, coupled with the prevalence of agricultural practices involving fertilizer and pesticide use, presents inherent challenges to air quality. The elevation is relatively low, around 550 meters above sea level, which can exacerbate temperature inversions, trapping pollutants close to the ground, particularly during cooler months. The surrounding landscape, primarily composed of grasslands and cultivated fields, contributes to dust emissions, especially during dry periods and agricultural operations.

Río Segundo’s air quality experiences a distinct seasonal cycle heavily influenced by regional weather patterns. The warmer months, typically December to February, are generally characterized by higher temperatures and increased convective activity, leading to better air dispersion and lower pollution levels. However, periods of intense heat can still contribute to ozone formation, particularly during stagnant air masses. The transition seasons, March-May and September-November, often present more complex air quality scenarios. During autumn (March-May), the drying of agricultural fields and harvesting activities can generate significant particulate matter, leading to localized air quality degradation. Spring (September-November) can be prone to dust storms originating from the Pampas, further impacting air quality. Winter (June-August) presents the most significant challenges. The cooler temperatures and frequent temperature inversions trap pollutants near the ground, leading to prolonged periods of reduced air quality. Fog, common during these months, further exacerbates the issue by limiting dispersion. Agricultural burning, although regulated, can also contribute to elevated particulate matter levels during this period. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting outdoor activity on days with visibly reduced air quality. During the warmer months, while generally better, avoiding strenuous outdoor activity during peak ozone hours (typically mid-afternoon) is advisable. Regular monitoring of local weather conditions and any available air quality advisories is crucial for informed decision-making.