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Miguel Alves, nestled in the southeastern region of Piauí, Brazil, occupies a geographically significant position within the larger Sertão region, a vast semi-arid expanse. Located at approximately -4.1658° latitude and -42.8950° longitude, the city sits at a modest elevation of around 330 meters (1,083 feet) above sea level. The surrounding landscape is characterized by undulating plains and gently sloping hills, typical of the transitional zone between the central plateau and the coastal plains. While not directly adjacent to major rivers, Miguel Alves benefits from the presence of smaller tributaries and seasonal streams, crucial for water resources in this dry climate. The urban fabric of Miguel Alves is relatively compact, reflecting its historical development as a regional agricultural hub. The dominant land use is a blend of residential areas, small commercial zones, and agricultural fields extending outwards. The urban–rural gradient is gradual, with agricultural activities seamlessly integrating into the city's periphery. The proximity to the São Francisco River, though not immediate, influences regional climate patterns and water availability. Significant agricultural activity, particularly soybean and corn cultivation, alongside livestock farming, contributes to the regional economy. The prevailing winds, often originating from the Atlantic, can transport pollutants inland, while the relatively flat terrain can exacerbate the accumulation of particulate matter, especially during periods of reduced wind speed. The lack of significant topographic barriers limits dispersion, potentially impacting local air quality. The city’s location within a predominantly agricultural zone means that agricultural practices, including burning for land clearing (though increasingly regulated), can be a source of localized air pollution.

Miguel Alves experiences a distinctly tropical climate, characterized by a pronounced dry season and a shorter, less intense wet season. Air quality in Miguel Alves is heavily influenced by these seasonal shifts. During the dry season, typically from May to September, the lack of rainfall and consistently high temperatures create conditions conducive to particulate matter accumulation. Reduced wind speeds during this period limit the dispersion of pollutants, leading to a noticeable increase in localized air quality concerns. Temperature inversions, common during the cooler months, trap pollutants near the ground, further exacerbating the situation. The months of July and August often see the most stagnant air conditions. Conversely, the wet season, from November to March, brings relief through frequent rainfall, which naturally washes away particulate matter and helps to cleanse the atmosphere. Increased humidity also tends to suppress dust generation. However, intense rainfall events can occasionally lead to flooding and the release of pollutants from inundated areas. The transitional months of April and October present a mixed picture, with fluctuating rainfall and wind patterns. Agricultural activities, particularly the burning of vegetation for land preparation, can contribute to elevated pollution levels during these periods. 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 activities. During the wet season, while generally cleaner, vigilance regarding potential flood-related pollutants is advised.