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Chebli, nestled within the Blida Province of Algeria, occupies a geographically significant position in the country’s north-central region. Located at coordinates 36.5778, 3.0083, the city sits on the northern slopes of the Tell Atlas mountain range, a landscape characterized by rolling hills and fertile plains. Its elevation, approximately 160 meters above sea level, contributes to a temperate climate, though susceptible to variations influenced by its proximity to the Mediterranean Sea, roughly 60 kilometers to the north. The surrounding terrain is predominantly agricultural, with olive groves, vineyards, and cereal crops dominating the landscape. Blida Province itself is a key agricultural hub for Algeria, and Chebli benefits from this, but also potentially suffers from associated agricultural emissions like ammonia. The urban-rural gradient is relatively sharp; Chebli is a smaller city, quickly transitioning to rural farmland. Industrial activity is concentrated in Blida city, creating a potential for pollutant transport via prevailing winds. The city’s location within a valley can also exacerbate pollution events, trapping emissions during periods of calm weather. This combination of factors makes Chebli’s air quality particularly sensitive to regional and local emission sources.

Chebli experiences a Mediterranean climate, dictating a clear seasonal pattern in air quality. Summer (June-August) often sees elevated particulate matter due to dry conditions and increased dust blown from the Sahara Desert, exacerbated by agricultural activities. High temperatures promote ozone formation, impacting respiratory health. Autumn (September-November) brings a temporary improvement as rainfall washes away accumulated pollutants, but stagnant air masses can lead to localized smog. Winter (December-February) is generally the period of poorest air quality. Temperature inversions, common in valleys like Chebli’s, trap pollutants near the ground, leading to increased concentrations of particulate matter and nitrogen dioxide from domestic heating sources – wood and charcoal burning are prevalent. Spring (March-May) offers a gradual improvement, with increasing rainfall and wind dispersal. However, agricultural burning for land preparation can cause temporary spikes in pollution. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during winter and periods of Saharan dust intrusion. Avoiding peak hours near roads and agricultural areas is also advisable. Monitoring wind direction is crucial; winds from the south often carry dust, while those from the industrial areas of Blida can bring higher levels of nitrogen oxides.