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Santana do Matos, nestled within the state of Rio Grande do Norte in northeastern Brazil, occupies a relatively flat terrain at an elevation of approximately 140 meters. Its coordinates (-5.9578, -36.6558) place it inland, roughly 20 kilometers from the Atlantic coastline. The surrounding landscape is dominated by the semi-arid Caatinga biome, characterized by scrubland vegetation adapted to prolonged droughts. This region experiences significant seasonal rainfall variations. The city’s urban character is typical of smaller Brazilian municipalities, with a central core surrounded by expanding residential areas and agricultural land. While not a major industrial hub, Santana do Matos supports local agriculture, primarily subsistence farming and livestock raising. The proximity to the coast introduces the potential for salt spray and marine aerosols influencing local air composition. The urban-rural gradient is relatively sharp, with agricultural practices – including occasional controlled burns for land clearing – being a key factor in localized air quality. Dust from unpaved roads and agricultural activities contributes to particulate matter, particularly during the dry season. The prevailing winds, generally from the east-southeast, carry coastal influences inland, while westerly winds can transport dust from the interior. This interplay of factors shapes the city’s unique air quality profile.

Santana do Matos experiences a distinct wet and dry season, heavily influencing air quality. The dry season, typically from August to December, sees a significant increase in particulate matter. Reduced rainfall leads to drier soils, facilitating the resuspension of dust from agricultural lands and unpaved roads. Controlled burns for agricultural purposes during this period exacerbate particulate pollution, creating hazy conditions. Temperature inversions, common during the cooler nights of the dry season, trap pollutants near the ground, worsening air quality. January to July marks the wet season, bringing relief from dust and smoke. Rainfall effectively washes pollutants from the atmosphere, improving air quality considerably. However, high humidity can promote the formation of mold and allergens, potentially impacting respiratory health. March and April, during the transition from wet to dry, can experience fluctuating conditions. Sensitive individuals – children, the elderly, and those with respiratory conditions – should exercise caution during the dry season, limiting outdoor activity on days with visible haze. Monitoring local weather patterns and avoiding strenuous activity during peak pollution times is advisable. The consistent easterly breezes offer some dispersion, but localized sources can still create pockets of poor air quality.