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Pentecoste, Ceará, Brazil, occupies a strategic position within the northeastern Brazilian landscape, approximately 50 kilometers inland from the Atlantic coast. Its coordinates, -3.7928, -39.2700, place it within a predominantly flat, low-lying terrain characteristic of the Serra da Baturité foothills. The city’s urban fabric is relatively compact, reflecting its historical development as an agricultural and commercial hub for the surrounding region. The landscape surrounding Pentecoste is a mosaic of *caatinga* vegetation, a semi-arid biome adapted to seasonal drought, interspersed with cultivated fields and pastureland. This agricultural activity, primarily focused on livestock and rain-fed crops like beans and corn, contributes to localized dust emissions, particularly during the dry season. The proximity to the Atlantic Ocean introduces a maritime influence, moderating temperatures and occasionally bringing in coastal breezes. However, the inland location also means that Pentecoste is somewhat shielded from the direct cleansing effects of the ocean winds. The urban–rural gradient transitions quickly, with agricultural lands dominating the immediate periphery. There are no major industrial belts directly adjacent to Pentecoste; however, larger industrial centers are located further west, potentially influencing regional air quality patterns through long-range transport of pollutants. The elevation, generally below 100 meters, contributes to potential temperature inversions, especially during the cooler months, which can trap pollutants near the ground. The Rio Pentecoste, a significant watercourse, flows through the city, influencing local humidity and microclimates.

Pentecoste’s tropical climate dictates a distinct wet and dry season pattern, profoundly impacting air quality. The dry season, typically spanning from July to November, is characterized by intense solar radiation, high temperatures, and minimal rainfall. This period often witnesses elevated levels of particulate matter due to increased dust resuspension from agricultural fields and unpaved roads, exacerbated by wind events common during this time. Temperature inversions are more frequent during the cooler dry season nights, trapping pollutants closer to the ground. The wet season, from February to June, brings relief through frequent rainfall, effectively scrubbing the atmosphere and reducing particulate concentrations. However, heavy downpours can temporarily increase humidity and contribute to the formation of ground-level ozone, particularly during periods of intense sunlight following rainfall. The transition months (December-January and June-February) are typically characterized by more variable weather patterns, with fluctuating wind speeds and occasional rainfall, leading to unpredictable air quality. Outdoor activities are generally best enjoyed during the wet season, particularly in the mornings before solar heating intensifies. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting prolonged outdoor exposure and avoiding strenuous activity during peak dust events. The interplay of wind patterns, temperature fluctuations, and rainfall dictates the seasonal air quality narrative in Pentecoste, demanding adaptive strategies for public health and environmental management.