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Curepipe, nestled in the Plaines Wilhems district of Mauritius, occupies a geographically significant position within the island’s central plateau. At an elevation of approximately 520 meters (1,706 feet) above sea level, it’s one of the highest urban centers on the island, affording panoramic views of the surrounding landscape. The city’s terrain is gently undulating, characterized by rolling hills and fertile agricultural land. This plateau environment, while visually appealing, presents unique challenges for air quality. Curepipe sits within a region dominated by sugarcane cultivation, with extensive fields stretching outwards, influencing local wind patterns and potentially contributing to particulate matter through agricultural practices like burning. To the east, the Black River Gorges National Park provides a natural buffer, offering some degree of air purification, while the coastal regions lie to the west and south, influencing prevailing winds and sea breezes. The urban–rural gradient around Curepipe is relatively gradual, with smaller villages and agricultural holdings blending seamlessly into the urban fabric. The proximity to Port Louis, the nation’s capital and primary industrial hub, means that Curepipe can occasionally experience transported pollutants, particularly during periods of stagnant air. The island’s volcanic origin has resulted in soil composition that can influence dust generation, further impacting local air quality. The surrounding landscape, a mix of cultivated land, residential areas, and pockets of natural vegetation, collectively shapes the city’s microclimate and its susceptibility to air pollution.

Mauritius’s tropical climate dictates a wet and dry season cycle, significantly impacting Curepipe’s air quality. The dry season, typically from May to October, often sees a slight increase in particulate matter due to increased agricultural activity, including controlled burns for land preparation, although regulations aim to minimize this. The prevailing southeast trade winds are generally stronger during this period, helping to disperse pollutants, but periods of calm can lead to localized stagnation. The wet season, from November to April, brings increased rainfall, which naturally helps to cleanse the atmosphere by washing away particulate matter. However, the increased humidity can exacerbate respiratory issues for sensitive individuals. Fog, a common occurrence during the cooler months (June-August) on the central plateau, traps pollutants close to the ground, creating localized air quality concerns. Temperature inversions, where cooler air is trapped beneath warmer air, are less frequent than in temperate climates but can occur, particularly during the transition periods between seasons, leading to pollutant accumulation. During the wettest months (January-February), heavy rainfall can temporarily improve air quality, but the associated cloud cover can reduce solar radiation, impacting air quality indirectly. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should be particularly mindful during periods of calm winds or fog, limiting strenuous outdoor activity and ensuring adequate ventilation indoors. The shoulder months (April/May and October/November) often present a mix of conditions, requiring vigilance and awareness of local weather patterns.