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Lajeado, nestled in the heart of Rio Grande do Sul, Brazil, occupies a geographically significant position within the Campanha Plateau. Its coordinates, -29.4669, -51.9614, place it amidst a gently undulating terrain characterized by rolling hills and valleys, typical of the pampas biome. The city’s elevation, averaging around 270 meters above sea level, contributes to localized microclimates and influences air circulation patterns. Lajeado is bisected by the Turvo River, a vital waterway that not only provides a source of freshwater but also moderates local temperatures and influences humidity levels. The surrounding landscape is a mosaic of agricultural land – primarily soybean, wheat, and cattle pastures – interspersed with pockets of native grasslands. This strong agricultural presence, while economically crucial, introduces potential sources of air pollution, particularly during planting and harvesting seasons due to dust and pesticide drift. The urban–rural gradient transitions relatively smoothly, with smaller agricultural settlements and rural communities bordering the city limits. To the west, the landscape gradually rises, while to the east, it gently slopes towards lower-lying areas. Lajeado’s regional position, within a densely populated and industrialized state, means it’s indirectly affected by pollution originating from larger urban centers like Porto Alegre, although the distance and prevailing winds generally mitigate direct impacts. The city’s relatively compact urban footprint, combined with the surrounding agricultural belt, creates a unique interplay of urban and rural influences on air quality.

Lajeado’s subtropical climate dictates a distinct seasonal pattern in air quality. The summer months (December to February) are typically characterized by high temperatures and humidity, often leading to stagnant air conditions and a greater propensity for pollutant accumulation. While rainfall is frequent, it’s often insufficient to effectively cleanse the atmosphere, and periods of intense heat can exacerbate ozone formation. Autumn (March to May) brings cooler temperatures and increased wind speeds, generally improving air quality as pollutants are dispersed more effectively. However, agricultural activities intensify during this period, potentially increasing particulate matter from field operations. Winter (June to August) often presents the most challenging period for air quality. Cold, stable air masses frequently lead to temperature inversions, trapping pollutants near the ground. Fog, common during these months, further restricts dispersion. Spring (September to November) sees a gradual improvement as temperatures rise and wind patterns become more dynamic. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during winter months, limiting outdoor exertion on days with persistent fog or stagnant air. During the summer, avoiding strenuous activity during peak heat hours is advisable. Agricultural workers should prioritize protective measures like masks during planting and harvesting, and residents should be mindful of potential pesticide drift, particularly on windy days. Monitoring local weather forecasts for temperature inversions and fog is crucial for informed decision-making regarding outdoor activities.