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Progreso, Canelones, Uruguay, occupies a strategically important position within the Río de la Plata basin, approximately 45 kilometers west of Montevideo, the nation’s capital. The city’s geography is characterized by a gently undulating terrain, part of the broader Uruguayan Pampas, a vast expanse of fertile grasslands. Its location along the coastline of the Río de la Plata estuary significantly influences its microclimate and, consequently, its air quality. Progreso sits at a relatively low elevation, averaging around 30 meters above sea level, minimizing the potential for natural air dispersion through altitude. The surrounding landscape is predominantly agricultural, with extensive fields dedicated to cattle ranching and crop cultivation (soybeans, wheat, and maize are common). This agricultural activity, while vital to the regional economy, can contribute to localized air pollution through dust emissions during tilling and harvesting, and ammonia release from livestock operations. To the east lies the expansive Río de la Plata, a major waterway impacting humidity and wind patterns. The urban–rural gradient around Progreso is gradual; the city blends seamlessly into the agricultural landscape, with smaller settlements and farms dotting the surrounding area. There are no major industrial belts immediately adjacent to Progreso, though Montevideo’s industrial zones exert a regional influence, occasionally impacting air quality through long-range transport of pollutants. The prevailing winds generally blow from the southwest, carrying potential pollutants from the interior towards the estuary and Progreso.

Progreso’s air quality experiences a distinct seasonal cycle dictated by Uruguay’s temperate climate. Summer (December-February) typically brings drier conditions and higher temperatures, often accompanied by periods of atmospheric stability. This can lead to temperature inversions, where a layer of warm air traps cooler air near the ground, hindering vertical mixing and concentrating pollutants. While agricultural activity is reduced during this period, dust from unpaved roads can become a concern. Autumn (March-May) sees a gradual increase in rainfall and wind, which generally improves air quality by dispersing accumulated pollutants. Winter (June-August) is characterized by cooler temperatures and increased humidity, sometimes resulting in fog, particularly near the Río de la Plata. Fog can trap pollutants close to the ground, leading to localized episodes of reduced visibility and potentially impacting air quality. Spring (September-November) marks a transition period with increasing temperatures and more frequent wind, gradually improving air quality. The months of July and August, with their potential for fog and temperature inversions, are periods when sensitive individuals, such as those with respiratory conditions or young children, should exercise caution and limit prolonged outdoor exposure. Conversely, spring months, with their increased ventilation, are generally favorable for outdoor activities. Agricultural practices, particularly during the planting and harvesting seasons in spring and autumn, can contribute to temporary spikes in particulate matter, necessitating awareness and protective measures for vulnerable populations.