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Walvisbaai, nestled within the Erongo region of Namibia, occupies a unique coastal position at -22.9494° latitude and 14.5069° longitude. The city’s geography is dominated by the Walvis Bay lagoon, a Ramsar site of international importance for its birdlife, and the expansive Atlantic Ocean. This proximity to the sea significantly influences local weather patterns and, consequently, air quality. The terrain is generally flat, transitioning from sandy coastal plains to slightly undulating landscapes inland. The urban character is a blend of residential areas, commercial zones centered around the harbour, and industrial activity related to fishing, salt production, and logistics. Surrounding Walvisbaai is a mosaic of landscapes: to the east lie arid plains and the foothills of the Namib Desert, while to the south, the terrain rises gradually. This desert proximity introduces a potential source of dust and particulate matter, particularly during windy periods. The urban–rural gradient is relatively sharp, with the city quickly giving way to sparsely populated rural areas and extensive desert landscapes. The harbour acts as a significant industrial hub, with shipping activities and related industries contributing to localized emissions. Agricultural zones are limited, primarily focused on small-scale farming and livestock grazing further inland, minimizing their direct impact on Walvisbaai’s air quality. The prevailing south-westerly winds, characteristic of the Benguela Current system, play a crucial role in dispersing pollutants, but can also transport dust from the interior, creating episodic air quality challenges.

Walvisbaai’s air quality experiences a distinct seasonal pattern largely dictated by its climate and prevailing winds. The region experiences a dry climate with minimal rainfall, resulting in a predominantly dry season spanning most of the year. During the cooler months (June-August), temperature inversions are more frequent, particularly during foggy mornings. These inversions trap pollutants near the ground, potentially leading to localized increases in particulate matter, especially from harbour activities and vehicle emissions. Fog, a common occurrence, while visually striking, can also contribute to elevated humidity and the condensation of pollutants. The warmer months (November-February) are characterized by stronger, more consistent south-westerly winds, which generally disperse pollutants effectively, leading to improved air quality. However, these winds can also carry dust from the Namib Desert, resulting in occasional episodes of elevated particulate matter. The transitional months (March-May and September-October) are often marked by variable wind patterns and increased dust activity, making air quality less predictable. Sensitive groups, such as individuals with respiratory conditions and young children, should exercise caution during periods of fog or high dust levels, limiting outdoor exertion and wearing appropriate masks if necessary. While generally good, awareness of these seasonal variations is key to minimizing potential health impacts. The dry conditions also mean that vegetation cover is limited, reducing natural air filtration.