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Passo de Camarajibe, nestled in the state of Alagoas, Brazil, occupies a relatively flat coastal plain location at approximately -9.2378 latitude and -35.4928 longitude. The city’s geography is heavily influenced by its proximity to the Atlantic Ocean, approximately 15km east, and the surrounding *agreste* region – a transitional zone between the humid coastal forests and the semi-arid *sertão*. This positioning creates a unique microclimate. The terrain is gently undulating, with elevations rarely exceeding 50 meters above sea level, contributing to limited natural air dispersion. Passo de Camarajibe is primarily a rural municipality, though experiencing increasing urbanization, with a population of around 13,804. The surrounding landscape is dominated by sugarcane plantations and small-scale agriculture, typical of the Alagoas coastal region. While not a major industrial hub, the presence of agricultural activities, including the burning of sugarcane fields post-harvest, significantly impacts local air quality. The urban-rural gradient is relatively sharp, with pockets of denser settlement surrounded by extensive agricultural land. This proximity to agricultural sources, combined with the flat terrain and limited wind flow, creates conditions conducive to pollutant accumulation, particularly during drier periods. The coastal breezes offer some relief, but are often insufficient to fully clear localized emissions.

Passo de Camarajibe experiences a tropical climate, characterized by a distinct wet and dry season rather than traditional four seasons. Air quality concerns peak during the dry season, typically from September to February. This is when agricultural burning of sugarcane stalks is most prevalent, releasing significant particulate matter (PM) and other pollutants. Lower humidity and reduced rainfall during these months also mean less atmospheric cleansing. Temperature inversions, common in the mornings, trap pollutants near the ground, exacerbating the issue. The wet season, from March to August, generally brings improved air quality due to increased rainfall washing pollutants from the atmosphere and higher humidity suppressing dust. However, even during the wet season, localized pollution from vehicle emissions and small-scale industries can be a concern. November and December are particularly challenging months due to the peak of sugarcane harvest and burning. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during these periods. Conversely, April through June generally offer the most favourable conditions for outdoor exercise. Monitoring wind direction is crucial; winds from agricultural areas will carry higher pollutant loads.