Hennaya Air Quality Index (AQI)

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Hennaya, nestled within the Tlemcen Province of Algeria, occupies a geographically significant position in the Maghreb region. Located at coordinates 34.9500, -1.3667, the city is situated in a valley amidst the Tell Atlas mountains, a landscape characterised by rolling hills and forested slopes. This terrain significantly influences local air quality, creating natural basins where pollutants can accumulate, particularly during temperature inversions. The elevation, while not extreme, contributes to cooler temperatures and increased precipitation compared to lower-lying areas further south. Hennaya isn’t directly on the coast, but is relatively close to the Mediterranean Sea, approximately 30km distant, which moderates temperatures but doesn’t provide significant wind flushing. The surrounding area is a mix of agricultural land – primarily olive groves and vineyards – and increasingly, small-scale industrial activity related to food processing and light manufacturing. The urban-rural gradient is fairly sharp; the city itself is compact with a population of 26,515, quickly transitioning to rural farmland and mountainous terrain. Dust from agricultural practices and potential emissions from these industries contribute to particulate matter in the air, exacerbated by the valley’s topography which limits dispersion. The city’s growth is constrained by the surrounding hills, leading to denser building patterns and potentially reduced ventilation.

Hennaya’s air quality follows a distinct seasonal pattern. Spring (March-May) sees a gradual improvement after the winter, but agricultural burning for land preparation can temporarily elevate particulate matter. Summer (June-August) is typically the clearest period, with prevailing winds offering some dispersion, though high temperatures can promote ozone formation. However, prolonged dry spells increase dust suspension. Autumn (September-November) marks a deterioration as temperatures drop and temperature inversions become more frequent, trapping pollutants in the valley. This is often coupled with increased domestic heating using wood and other solid fuels. Winter (December-February) is generally the worst period for air quality. Cold, stagnant air masses settle in the valley, exacerbating the effects of temperature inversions and trapping emissions from heating sources. Fog, common during winter mornings, further reduces visibility and concentrates pollutants near the ground. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during autumn and winter months. Spring and summer offer more favourable conditions, but even then, monitoring local conditions is advisable. The lack of significant rainfall throughout much of the year means pollutants aren’t efficiently washed away, contributing to their persistence.