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Lebon Régis, nestled in the Serra da Mantiqueira mountain range of Santa Catarina, Brazil, occupies a geographically significant position within the state and the broader Southeast South region. Located at approximately -26.93° latitude and -50.69° longitude, the city’s elevation, averaging around 950 meters (3,117 feet) above sea level, immediately influences its microclimate and, consequently, its air quality. The surrounding landscape is dominated by rolling hills, dense Atlantic Forest remnants, and agricultural land, primarily dedicated to coffee and sugarcane cultivation. This rural-urban gradient is crucial; agricultural practices, particularly burning during land clearing and harvesting, can contribute to localized air pollution events. Lebon Régis sits within a valley, which, while providing scenic beauty, can also trap pollutants, especially during periods of low wind. The city’s proximity to larger urban centers like São Paulo, though not immediate, means it can be affected by regional pollution transport, particularly during stable atmospheric conditions. The Mantiqueira range acts as a barrier, influencing prevailing wind patterns and potentially hindering the dispersion of pollutants. The climate is typically humid subtropical, with distinct wet and dry seasons, further impacting atmospheric stability and pollutant behavior. The relatively small population of 11,472 suggests a primarily rural character, though increasing tourism and light industry could introduce new pollution sources. Understanding this interplay of topography, land use, and regional connectivity is vital for assessing and managing Lebon Régis’s air quality.

Lebon Régis experiences a tropical wet-dry climate, dictating a distinct seasonal pattern in air quality. The dry season, typically from April to September, often sees a build-up of pollutants due to reduced rainfall and lower humidity. This period is characterized by increased sunshine, which can exacerbate photochemical smog formation if volatile organic compounds (VOCs) are present, stemming from agricultural activities or vehicle emissions. Temperature inversions, common during the cooler, drier months, trap pollutants near the ground, leading to periods of stagnant air and potentially elevated concentrations of particulate matter. Conversely, the wet season (October to March) brings frequent rainfall, naturally cleansing the atmosphere and dispersing pollutants. However, intense storms can also stir up dust and soil particles, temporarily degrading air quality. Fog, particularly prevalent during the dry season mornings, can also trap pollutants, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of stagnant air or fog. Agricultural burning, a common practice in the surrounding areas, is most likely to occur during the dry season, significantly impacting air quality. While the wet season generally offers improved air quality, heavy rainfall events can still pose a temporary risk. Outdoor activities are generally more favorable during the wet season, but awareness of potential dust events remains important.