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Itagi, Bahia, Brazil, occupies a strategic position within the semi-arid Sertão region of the state, a landscape dramatically shaped by centuries of fluctuating rainfall and intense solar radiation. Located at approximately -14.1628° latitude and -40.0058° longitude, the city sits at a modest elevation of around 530 meters above sea level, contributing to a generally drier climate. The surrounding terrain is characterized by undulating plains and low hills, typical of the Sertão, with sparse vegetation adapted to the arid conditions – primarily xerophytic shrubs and cacti. While Itagi itself lacks immediate proximity to major rivers or coastlines, it lies within the broader hydrographic basin of the São Francisco River, a vital water source for the region, though its influence on local air quality is indirect. The urban fabric of Itagi is relatively compact, reflecting its smaller population of approximately 13,803. The dominant land use is residential, interspersed with small commercial areas and agricultural plots. The urban–rural gradient is gradual, transitioning quickly to the characteristic scrubland of the Sertão. Agriculture, primarily subsistence farming and livestock rearing, plays a significant role in the local economy, potentially contributing to localized dust and particulate matter. There are no major industrial belts immediately adjacent to Itagi; however, larger regional centers with industrial activity are located further afield, and prevailing winds can occasionally transport pollutants from these sources. The region's susceptibility to drought and desertification also influences air quality, with wind erosion contributing to dust levels, particularly during drier periods.

Itagi's tropical climate dictates a distinct wet and dry season pattern, profoundly influencing its air quality. The dry season, typically spanning from April to September, is characterized by intense heat, low humidity, and infrequent rainfall. This period often witnesses elevated levels of particulate matter, primarily due to wind erosion of the exposed soil and agricultural lands. Strong winds, common during this season, readily lift dust and sand, reducing visibility and impacting respiratory health. Temperature inversions, though less frequent than in cooler climates, can occasionally trap pollutants near the ground, exacerbating the situation. The wet season, from October to March, brings relief from the dust, as rainfall washes away accumulated pollutants and increases atmospheric moisture, which helps to settle particulate matter. However, heavy rainfall can also lead to increased humidity and the release of biogenic volatile organic compounds (BVOCs) from vegetation, potentially contributing to ground-level ozone formation under specific conditions. The months of August and September, at the peak of the dry season, are generally the least favorable for outdoor activities, particularly for children, the elderly, and individuals with pre-existing respiratory conditions. During these months, limiting strenuous outdoor exertion and wearing masks can help mitigate exposure. Conversely, the months of February and March, during the transition to the dry season, often offer the best air quality, with rainfall having cleansed the atmosphere and temperatures beginning to moderate. Maintaining green spaces within the city and promoting sustainable agricultural practices can further improve air quality throughout the year.