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Puri, located in the Uíge Province of Angola, occupies a geographically significant position within the country’s northwest region. Situated at approximately -7.6833 latitude and 15.6000 longitude, the city’s terrain is characterized by undulating hills and valleys, typical of the broader Angolan highlands. The elevation, while not exceptionally high, contributes to localized microclimates and influences air circulation patterns. Puri is nestled within a transitional zone, bordering both forested areas and agricultural lands, creating a distinct urban–rural gradient. The surrounding landscape is dominated by dense tropical rainforest, interspersed with small-scale farms cultivating crops like cassava, maize, and beans – agricultural practices that can contribute to localized particulate matter. While not directly adjacent to a major river, Puri benefits from proximity to smaller streams and seasonal watercourses, which can influence humidity levels and, consequently, the dispersion of pollutants. The region’s climate is tropical, with a distinct wet and dry season, impacting vegetation and soil moisture, both of which affect dust generation. There are no major industrial belts immediately surrounding Puri; however, the city serves as a regional hub for agricultural processing and small-scale trade, potentially generating emissions from vehicles and limited industrial activities. The city’s relatively small population (37,910) suggests a compact urban footprint, but population density variations within the city can still create localized air quality hotspots. Topography plays a crucial role; valleys can trap pollutants, while higher elevations may experience better ventilation.

Puri’s air quality is intrinsically linked to its tropical climate, exhibiting a clear seasonal pattern dictated by the wet and dry seasons. The dry season, typically spanning from June to September, often witnesses a noticeable increase in particulate matter concentrations. This is primarily due to reduced rainfall, leading to drier soil conditions and increased dust generation from agricultural activities and unpaved roads. Wind patterns during this period can be variable, sometimes leading to stagnant air conditions, particularly within the valleys, which exacerbate the accumulation of pollutants. Temperature inversions, though less frequent than in colder climates, can occasionally occur, trapping pollutants closer to the ground. The wet season, from October to May, brings frequent rainfall, which naturally helps to cleanse the atmosphere by removing particulate matter and gaseous pollutants. However, heavy rainfall can also lead to increased humidity, potentially affecting respiratory health for sensitive individuals. Fog, a relatively uncommon occurrence, can form during cooler periods, particularly in the early morning, further reducing air dispersion. Outdoor activities are generally more favorable during the wet season, especially from November to February, when rainfall is consistent. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, minimizing prolonged exposure to outdoor air, particularly during dusty periods. Maintaining indoor air quality through ventilation and air purification can also be beneficial. The intensity of agricultural burning, a common practice in the surrounding areas, significantly influences air quality during the transition periods between seasons.