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Boquim, Sergipe, Brazil, occupies a geographically significant position within the northeastern Brazilian landscape. Situated approximately 320 kilometers south of the state capital, Aracaju, the city rests on a gently undulating terrain characteristic of the coastal plains of Sergipe. Its coordinates, -11.1469, -37.6208, place it relatively close to the Atlantic coast, influencing its climate and, consequently, its air quality dynamics. The surrounding landscape is predominantly agricultural, with extensive areas dedicated to coconut plantations, mango orchards, and cassava farming – a typical feature of Sergipe’s rural economy. This agricultural activity, while vital to the region, can contribute to localized air pollution through the use of pesticides and the burning of agricultural residues, particularly during harvest seasons. The urban–rural gradient around Boquim is gradual, with small settlements and farms interspersed throughout the landscape. Elevation is relatively low, rarely exceeding 50 meters above sea level, which can exacerbate the trapping of pollutants during periods of atmospheric stability. The proximity to the Sergipe River, a major waterway, also plays a role, potentially influencing humidity levels and affecting the dispersion of airborne particles. While Boquim isn't directly adjacent to major industrial belts, its connection to regional transportation networks means it can be affected by emissions from passing vehicles. The coastal location also means it is susceptible to salt spray and marine aerosols, which can impact air quality and respiratory health.

Boquim’s tropical climate dictates a distinct wet and dry season pattern, significantly influencing its air quality throughout the year. The dry season, typically spanning from August to January, is characterized by lower rainfall and increased sunshine hours. While this might seem beneficial, the reduced precipitation allows for the accumulation of dust and particulate matter, particularly from agricultural activities and unpaved roads. The lack of rainfall also limits the natural cleansing effect of precipitation, leading to a potential build-up of pollutants. During this period, temperature inversions are more frequent, trapping pollutants closer to the ground, especially in the early morning hours. The wet season, from February to July, brings frequent rainfall and higher humidity. This increased precipitation effectively washes away particulate matter and helps to disperse gaseous pollutants, generally resulting in improved air quality. However, heavy rainfall can also lead to increased mold and fungal spores in the air, potentially affecting individuals with respiratory sensitivities. The months of September and October often experience a transitional period with increased wind speeds, which can help to ventilate the atmosphere and reduce pollution levels. Sensitive groups, such as children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning. Limiting outdoor activity during the early morning hours when inversions are most likely to occur is advisable. Maintaining indoor air quality through proper ventilation and air filtration can also provide relief.