Três Barras Air Quality Index (AQI)

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Três Barras, nestled in the heart of Santa Catarina state, Brazil, occupies a geographically significant position within the Serra Catarinense mountain range. Located at approximately -26.1058° latitude and -50.3219° longitude, the city’s elevation, averaging around 850 meters (2,789 feet) above sea level, contributes to a cooler climate compared to coastal regions of Santa Catarina. The surrounding landscape is dominated by rolling hills, dense Atlantic Forest remnants, and agricultural land, creating a distinct urban–rural gradient. The city itself exhibits a relatively compact urban footprint, characterized by residential areas interspersed with small-scale commercial establishments and limited industrial activity. While not directly adjacent to a major river, Três Barras benefits from proximity to smaller streams and tributaries that feed into larger river systems, influencing local humidity and microclimates. The Serra Catarinense range acts as a barrier, influencing prevailing wind patterns and potentially trapping pollutants under certain meteorological conditions. The region’s economy is largely driven by agriculture, particularly dairy farming and fruit cultivation, with associated activities like fertilizer application and livestock management impacting local air quality. The relatively small population of 19,746 suggests a lower overall pollution burden compared to larger urban centers, but localized impacts from agricultural practices and occasional biomass burning remain relevant considerations. The topography, combined with the Atlantic Forest’s influence, generally promotes some degree of natural air purification, though this can be overwhelmed by specific pollution events.

Três Barras experiences a subtropical highland climate, characterized by distinct wet and dry seasons rather than the four traditional seasons. The dry season, typically spanning from April to September, often sees a reduction in overall air quality due to increased biomass burning associated with agricultural land clearing and controlled burns for pasture management. This practice, while traditional, releases particulate matter and other pollutants into the atmosphere, particularly during drier, wind-calm periods. Temperature inversions, common during the cooler months of June and July, can trap these pollutants near the ground, exacerbating localized air quality issues. The wet season, from October to March, brings increased rainfall and higher humidity, which generally helps to cleanse the air by washing away particulate matter and diluting gaseous pollutants. However, periods of intense rainfall can also lead to soil erosion and the release of dust particles, temporarily impacting air quality. Fog, particularly during the transition months of May and September, can also trap pollutants, reducing visibility and potentially increasing exposure. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly on days with visible smoke or haze. Limiting outdoor exertion and avoiding areas with significant biomass burning are advisable. During the wet season, while overall air quality tends to be better, awareness of potential dust events following heavy rainfall remains important.