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Jeffrey’s Bay, nestled along the Eastern Cape coastline of South Africa at coordinates -34.0333, 24.9167, is a town fundamentally shaped by its geography. The settlement sprawls across a low-lying coastal plain, largely influenced by the adjacent Indian Ocean and the Gamtoos River estuary to the west. Elevation is minimal, rarely exceeding 50 meters above sea level, contributing to limited atmospheric dispersion. The surrounding landscape is characterised by dune systems, particularly prominent to the north and south of the town, and patches of coastal fynbos vegetation. While not heavily industrialised, Jeffrey’s Bay serves as a regional service centre for surrounding agricultural areas, primarily livestock farming and citrus cultivation further inland. The urban-rural gradient is relatively sharp; moving inland quickly transitions from a tourist-focused coastal town to more dispersed rural settlements. This proximity to agricultural practices introduces potential for particulate matter from field preparation and livestock dust. The dominant wind direction, blowing from the south-east, carries marine aerosols inland, while north-westerly winds can transport dust from drier interior regions. The town’s linear development along the N2 highway also concentrates traffic emissions. The coastal location, while providing recreational benefits, limits the flushing of pollutants by prevailing winds, occasionally leading to localised build-up.

Jeffrey’s Bay experiences a Mediterranean-like climate, with distinct seasonal variations impacting air quality. Winter (June-August) often sees increased particulate matter from residential wood burning for heating, coupled with temperature inversions trapping pollutants near ground level. Calm, cool conditions exacerbate this, making it a less favourable time for those with respiratory sensitivities. Spring (September-November) brings a gradual improvement as temperatures rise and winds become more frequent, dispersing pollutants. However, increased agricultural activity – ploughing and harvesting – can contribute to dust levels. Summer (December-February) is generally the period of best air quality, driven by strong south-easterly sea breezes that effectively flush out pollutants. However, occasional berg winds, hot and dry, can bring dust from the interior. Autumn (March-May) sees a transition period, with decreasing wind speeds and a potential for localised pollution build-up. Fog, common during autumn and winter mornings, can trap pollutants, reducing visibility and impacting respiratory health. Sensitive individuals – children, the elderly, and those with pre-existing conditions – should limit strenuous outdoor activity during calm, cold winter mornings and periods of fog. Monitoring wind direction is crucial; winds from the north-west may indicate higher dust concentrations.