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Mégrine, a municipality within the Ben Arous Governorate of Tunisia, occupies a crucial position in the country’s urban landscape, situated just southeast of the capital, Tunis. Its coordinates (36.7667, 10.2333) place it within a relatively flat coastal plain, gently sloping inland. The terrain is characterised by agricultural land, interspersed with growing residential areas reflecting suburban expansion from Tunis. Mégrine’s proximity to the Mediterranean Sea, approximately 5km to the north, introduces maritime influences on local weather patterns, but also potential for salt spray and humidity. The surrounding region is a mix of intensive agriculture – olive groves, citrus farms, and vegetable production – and light industrial activity concentrated around Tunis and Sousse. This blend is a key factor influencing air quality. The urban-rural gradient is pronounced; moving inland from the coast, agricultural emissions and dust become more significant, while closer to Tunis, traffic and industrial pollutants dominate. The lack of significant topographical features – hills or valleys – means pollutants can accumulate easily, particularly during stable atmospheric conditions. The city’s location within a densely populated coastal corridor exacerbates these challenges, creating a localised ‘heat island’ effect that can trap pollutants. Understanding this geographic context is vital for addressing Mégrine’s air quality concerns.

Mégrine’s air quality follows a distinct seasonal pattern, largely dictated by meteorological conditions and agricultural practices. Summer (June-August) often sees a slight improvement in air quality due to prevailing northerly winds dispersing pollutants offshore, though high temperatures can promote ground-level ozone formation. However, this is often offset by increased dust from agricultural activities. Autumn (September-November) brings a transition period, with decreasing temperatures and potentially more stagnant air, leading to pollutant build-up. This is also harvest season, increasing particulate matter from agricultural burning. Winter (December-February) is typically the period of poorest air quality. Temperature inversions are common, trapping pollutants close to the ground, and reduced wind speeds limit dispersion. Heating using wood or other solid fuels contributes to particulate matter concentrations. Spring (March-May) sees a gradual improvement as temperatures rise and winds become more frequent, but the risk of dust storms remains. Sensitive individuals – children, the elderly, and those with respiratory conditions – should limit strenuous outdoor activity during winter and autumn months. Monitoring wind patterns and avoiding peak agricultural burning periods are crucial for protecting public health. Fog, common in winter mornings, can exacerbate particulate matter issues.