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Sítio do Quinto, nestled within the state of Bahia, Brazil, occupies a geographically significant position within the broader Salvador metropolitan region. Located at approximately -10.3500 latitude and -38.2169 longitude, the city’s terrain is characterized by undulating hills and valleys, typical of the Bahian coastal plains. Its elevation, while relatively modest, contributes to localized microclimates and influences air circulation patterns. The surrounding landscape is a mosaic of urban development, small-scale agriculture, and remnants of Atlantic Forest biome, though the latter is increasingly fragmented. Sítio do Quinto benefits from proximity to the Atlantic Ocean, approximately 15 kilometers to the east, which moderates temperatures and introduces maritime influences on air quality. However, this proximity also means the city is susceptible to coastal breezes carrying pollutants from industrial areas further down the coast. The urban–rural gradient is gradual, with agricultural activities, primarily focused on fruit and vegetable cultivation, interspersed within the expanding urban fabric. The city’s location within a rapidly growing metropolitan area means it is increasingly affected by regional pollution sources, including vehicular emissions from Salvador and industrial activity concentrated in the eastern part of the state. The prevailing winds, generally easterly, often transport pollutants inland, impacting air quality in Sítio do Quinto. The soil composition, largely derived from weathered granite, also influences dust generation, particularly during drier periods, further impacting local air quality. The topography creates areas where pollutants can accumulate, especially during periods of stagnant air.

Sítio do Quinto experiences a tropical climate, characterized by distinct wet and dry seasons rather than the four traditional seasons. The dry season, typically spanning from September to April, often sees a noticeable increase in particulate matter concentrations. This is largely due to reduced rainfall, which limits the natural cleansing effect of precipitation, and increased dust generation from exposed soil and construction activities. The lack of humidity also contributes to the formation of temperature inversions, particularly during the cooler months (December to February), trapping pollutants closer to the ground. During these periods, stagnant air conditions are common, exacerbating the problem. The wet season, from May to August, brings frequent rainfall and higher humidity, which naturally washes away pollutants and improves air quality. However, heavy rainfall can also lead to increased mold and fungal spore concentrations, impacting indoor air quality and potentially triggering respiratory issues. The prevailing easterly winds are generally stronger during the wet season, dispersing pollutants more effectively. Outdoor activities are generally more favorable during the wet season, particularly in the late afternoon and evening when temperatures are cooler. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, limiting prolonged outdoor exposure and avoiding strenuous activity during periods of stagnant air. Increased vigilance regarding indoor air quality, including ventilation and mold prevention, is also recommended during the wet season.