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Ferreiros, nestled in the Zona da Mata region of Pernambuco, Brazil, occupies a geographically significant position within a landscape characterized by rolling hills and a transition zone between the Atlantic Forest biome and the drier interior. Located at approximately -7.4478° latitude and -35.2439° longitude, the city’s elevation averages around 350 meters above sea level, influencing local air circulation patterns. The surrounding landscape is a mosaic of small-scale agriculture, primarily sugarcane cultivation and fruit orchards, interspersed with remnants of the Atlantic Forest. This agricultural activity, while vital to the local economy, contributes to potential sources of air pollutants, particularly during harvest seasons when burning is sometimes practiced. Ferreiros sits relatively close to the Atlantic coast, approximately 30 kilometers inland, benefiting from sea breezes that can help disperse pollutants, but also exposing the city to potential salt spray and coastal fog events. The urban–rural gradient is gradual, with smaller settlements and agricultural land extending outwards from the city center. There are no major industrial belts immediately adjacent to Ferreiros; however, larger industrial areas are present in Recife, approximately 100 kilometers to the north, and their influence on regional air quality, including occasional transport of pollutants, cannot be entirely discounted. The terrain, with its gentle slopes and valleys, can trap cool air and contribute to localized temperature inversions, particularly during the drier months, potentially exacerbating air pollution episodes.

Ferreiros experiences a tropical climate with distinct wet and dry seasons, significantly impacting air quality dynamics. The wet season, typically from March to August, brings frequent rainfall and high humidity, generally leading to improved air quality due to atmospheric cleansing. Rain effectively washes particulate matter from the air, and increased humidity can help suppress dust generation. However, periods of prolonged rainfall can also lead to increased mold and fungal spore concentrations, impacting indoor air quality and potentially triggering respiratory issues. The dry season, from September to February, is characterized by lower rainfall, higher temperatures, and increased sunshine. This period often sees a rise in air pollution, particularly from agricultural activities like sugarcane burning, which releases significant amounts of particulate matter and gases. Temperature inversions are more common during the dry season, trapping pollutants near the ground, especially in the mornings and evenings. Fog events, though infrequent, can also occur, further reducing air dispersion and concentrating pollutants. During the peak of the dry season (November-January), outdoor activities should be approached with caution, particularly for children, the elderly, and individuals with pre-existing respiratory conditions. Maintaining good ventilation indoors and avoiding strenuous activity during periods of visible haze are advisable. The transition months (February/March and August/September) offer a more moderate air quality profile, with a balance between rainfall and sunshine, making them generally favorable for outdoor pursuits.