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Monteiro, nestled in the Paraíba state of northeastern Brazil, occupies a geographically significant position within the Borborema Plateau. Its coordinates, -7.8894, -37.1200, place it amidst a landscape characterized by undulating terrain and rolling hills, typical of the Brazilian Highlands. The city’s elevation, averaging around 530 meters (1739 feet) above sea level, contributes to a generally cooler climate compared to coastal regions, though still within a tropical zone. Surrounding Monteiro is a mosaic of semi-arid scrubland (caatinga biome), interspersed with small-scale agricultural plots and cattle ranches. This agricultural activity, while vital to the local economy, can contribute to localized dust and particulate matter, particularly during drier periods. The city’s urban character is that of a regional service center, with a relatively low population density and a gradual urban–rural gradient extending outwards. While Monteiro isn't directly adjacent to major rivers, it benefits from seasonal streams and groundwater resources, influencing local humidity levels. It lies approximately 60 kilometers (37 miles) from the coastal city of Sousa, and is not within close proximity to major industrial belts. The prevailing winds, generally from the northeast, play a crucial role in dispersing pollutants, though topographic features can sometimes create localized areas of stagnant air. The caatinga vegetation, though drought-resistant, offers limited natural air filtration compared to denser forests, making the city’s air quality somewhat susceptible to regional dust events and agricultural emissions.

Monteiro’s tropical climate dictates a distinct wet and dry season pattern, significantly influencing its air quality. The dry season, typically spanning from August to November, is characterized by intense solar radiation, high temperatures, and minimal rainfall. This period often sees an increase in particulate matter due to wind erosion from the surrounding caatinga and agricultural lands. The lack of rainfall means less atmospheric cleansing, and the dry vegetation becomes a source of dust. Temperature inversions, though not as frequent as in colder climates, can occasionally trap pollutants near the ground, particularly during calm nights. Conversely, the wet season (December to July) brings frequent rainfall and higher humidity, naturally scrubbing the atmosphere and reducing particulate concentrations. The increased cloud cover also reduces solar radiation, impacting photochemical smog formation. February and March often experience intense rainfall events, leading to temporary improvements in air quality. During the transition months (May/June and August/September), wind patterns can be variable, leading to unpredictable air quality fluctuations. Sensitive groups, such as children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting outdoor activities during peak afternoon heat and avoiding areas prone to dust generation. The wet season generally offers more favorable conditions for outdoor pursuits, though heavy rainfall can temporarily disrupt visibility and increase humidity, which may affect some individuals. Maintaining green spaces within the city and promoting sustainable agricultural practices are key to mitigating seasonal air quality variations.