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Labiod Medjadja, nestled within the Chlef province of Algeria, occupies a geographically significant position approximately 120km west of Algiers. The city’s coordinates (36.2500° N, 1.4000° E) place it within the Tell Atlas mountain range foothills, a region characterised by rolling hills and fertile plains. The terrain is gently undulating, transitioning from higher elevations to the south towards the Chlef plateau. This location influences air quality significantly; the surrounding hills can trap pollutants during periods of calm weather, creating localised concentrations. The Mediterranean Sea lies roughly 40km to the north, providing a moderating influence on temperatures but also contributing to humidity which can exacerbate particulate matter issues. Labiod Medjadja isn’t directly within a major industrial belt, but the wider Chlef province has some industrial activity related to cement production and food processing. Surrounding the city are predominantly agricultural lands, primarily dedicated to cereal crops and olive groves. The urban-rural gradient is relatively sharp, with agricultural areas immediately bordering the city limits. Dust from agricultural practices, combined with potential emissions from local transport and residential heating, contribute to the city’s air quality profile. The prevailing winds, generally from the west, can transport pollutants from regional sources.

Labiod Medjadja experiences a Mediterranean climate with hot, dry summers and mild, wet winters. Air quality in Labiod Medjadja follows a distinct seasonal pattern. Summer (June-August) typically sees the highest pollution levels, driven by increased temperatures promoting ground-level ozone formation and reduced rainfall offering less atmospheric cleansing. Calm, stable air masses are common, trapping pollutants. Autumn (September-November) brings a gradual improvement as temperatures cool and the first rains arrive, dispersing accumulated pollutants. However, agricultural burning of crop residue during this period can cause temporary spikes in particulate matter. Winter (December-February) generally offers the cleanest air, with increased precipitation and stronger winds aiding dispersion. However, residential heating using wood or other solid fuels can contribute to localised particulate pollution, particularly during temperature inversions. Spring (March-May) is a transitional period, with fluctuating conditions. The ‘Chergui’ – a hot, dry, dusty wind from the Sahara – can occur in spring, significantly degrading air quality with high levels of particulate matter. Sensitive groups, including children, the elderly, and those with respiratory conditions, should limit outdoor activity during summer afternoons and periods of Saharan dust intrusion. Monitoring wind direction is crucial for anticipating pollution events.